The benefits of swimming, with Mark Foster

The benefits of swimming, with Mark Foster

Eight-time World Record holder and Zone3 ambassador Mark Foster has taken some time out from his busy training, modelling and general celebrity lifestyle to explain the physical benefits of swimming. If you’ve ever wondered what muscles you work when you swim, or what happens to your body as you race through the water, read on to get up to speed on the impact of this super-sport. 

There’s no denying swimming is a seriously energetic sport. It uses just about every muscle in your body and increases your aerobic fitness too. Even better, it burns energy while supporting your joints making it a great way to condition your body and get in shape. Naturally, I’m all for swimming but I’m not sure everyone knows just how good swimming can be for your health and fitness. So, here’s a breakdown of exactly what happens to your body when you go swimming.

What muscles will I work when I go swimming?

All strokes Before we get into each stroke, whichever stroke you choose, you’ll be working many of these muscle areas:
Core abdominal (stomach) & lower back muscles These are probably the most well known and talked about muscles so no need to go over old ground but these work together to keep your body steady and streamline in the water.
Shoulder & upper back muscles (forms the rounded contour of the shoulder and other shoulder muscles) These muscles help the hands have proper entry into the water and extend your reach as well as helping to stabilise your torso in the water and produce the drive. The ones you’ll notice most are around the shoulder area and the best known are the deltoid &trapezius, but there’s many more which sit below these and join the humerus (upper arm bone) to the core & vertebral system. Then there’s the Latissimus dorsi which sits under and below the trapezius.
The arm muscles These assist in propelling you through the water, not just the biceps & triceps but also the forearm (brachioradialis & flexor digitorumprofundus) & don’t forget the muscles in the hand (Thenars)
Glutes, groin and hamstrings Help move you forward and balance your body. Then it’s the quadriceps, hamstrings, calf (gastrocnemius), even the muscles around the shin and feet get in on the mix.

Front Crawl/Freestyle: Front Crawl is the stroke for speed – it moves you fast through the water and generates the most force. This is the stroke the vast majority of you will be familiar with and for those of you who are triathletes probably the only one you will ever use. What’s happening? When you’re using front crawl, your arms are pushing and pulling underwater, your torso is working hard to keep you steady and the rotation it provides can aid in giving you a longer stroke (think about the zipper drill if you’re not getting the most from this). Your hip flexors (at the top of your thighs) are engaged too, to maintain a steady kick.

Backstroke: Less intensive than front crawl, backstroke is a great recovery option, even if only a few lengths at the end of a session. What’s happening? As the name suggests, it works your back. Your lats(Latissimi dorsi) are engaged – that’s the wide muscle on either side of your back, beneath your shoulder blade. This muscle is pulling your arm under the water and then back to the surface again. In addition, your hamstrings (back of your thigh) and glutes (bum muscles) are engaged to propel you through the water.

Breaststroke: Synchronisation is key here – having the arms in time with the legs. This stroke will work all your muscle groups equally. What’s happening? Your shoulders are working hard to move your arms from behind to in front of you. The chest and your lats then work together lift your chest out of the water as you take a breath. Your legs are doing a frog kick that’s similar to leaping off the floor from a squat, working your glutes, quads (front of thigh), hamstring (back of thigh) and your calves, too.

Butterfly: Butterfly is a super-powerful stroke that will build strength and boost your metabolism. What’s happening? Both arms move simultaneously, working your shoulders, lats and arms. Your core and lower back muscles go into overdrive to stabilise your core in the water and lift your body out of the water, and your glutes ensure your legs move as one, like a dolphin. Phew! It’s energising just thinking about it. As far as an all-over body workout goes, it doesn’t get much better. Add to that increased lung capacity from taking huge breaths frequently and precisely, and swimming helps to improve your aerobic performance, too.

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zone3official
18/06/25
What a weekend up at Windermere 💦⛰️ The Great North Swim brought big energy, beautiful scenery, and plenty of Zone3 kit in the water. We had an awesome crew of ambassadors taking on the 5km swim, shoutout to @livs_is_livs who did it in skins 👏 and to @chloedooley who showed up and gave it everything. And a massive congrats to Zone3 Pro @j0m3sf1 for taking the win in the SwimRun - absolutely flying out there, despite the weather warnings! Open water season is officially on, and we’re buzzing to be part of it. @great_swim
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zone3official
18/06/25
What a weekend up at Windermere 💦⛰️ The Great North Swim brought big energy, beautiful scenery, and plenty of Zone3 kit in the water. We had an awesome crew of ambassadors taking on the 5km swim, shoutout to @livs_is_livs who did it in skins 👏 and to @chloedooley who showed up and gave it everything. And a massive congrats to Zone3 Pro @j0m3sf1 for taking the win in the SwimRun - absolutely flying out there, despite the weather warnings! Open water season is officially on, and we’re buzzing to be part of it. @great_swim
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zone3official
18/06/25
What a weekend up at Windermere 💦⛰️ The Great North Swim brought big energy, beautiful scenery, and plenty of Zone3 kit in the water. We had an awesome crew of ambassadors taking on the 5km swim, shoutout to @livs_is_livs who did it in skins 👏 and to @chloedooley who showed up and gave it everything. And a massive congrats to Zone3 Pro @j0m3sf1 for taking the win in the SwimRun - absolutely flying out there, despite the weather warnings! Open water season is officially on, and we’re buzzing to be part of it. @great_swim
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zone3official
15/06/25
What a weekend at the Great North Swim in Windermere! As proud swim sponsors, we loved being part of the action. Even with the odd downpour, spirits stayed high and the atmosphere was electric - a true celebration of community, determination, and open water adventure.
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zone3official
10/06/25
This weekend, the Zone3 team also volunteered at the incredible 24-Hour Swim Relay at Shepperton @levelwateruk 🏊‍♀️ We're proud to support Level Water, a charity that gives children with disabilities the opportunity to learn to swim, offering 1-to-1 lessons that empower kids with confidence, movement, and freedom in the water. The 24 hour event brought swimmers together for a non-stop relay challenge, raising vital funds to provide these lessons across the UK. To everyone swimming, supporting, and staying awake through the night: thank you for making a difference. This is what sport is all about.
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zone3official
10/06/25
This weekend, the Zone3 team also volunteered at the incredible 24-Hour Swim Relay at Shepperton @levelwateruk 🏊‍♀️ We're proud to support Level Water, a charity that gives children with disabilities the opportunity to learn to swim, offering 1-to-1 lessons that empower kids with confidence, movement, and freedom in the water. The 24 hour event brought swimmers together for a non-stop relay challenge, raising vital funds to provide these lessons across the UK. To everyone swimming, supporting, and staying awake through the night: thank you for making a difference. This is what sport is all about.
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zone3official
10/06/25
This weekend, the Zone3 team also volunteered at the incredible 24-Hour Swim Relay at Shepperton @levelwateruk 🏊‍♀️ We're proud to support Level Water, a charity that gives children with disabilities the opportunity to learn to swim, offering 1-to-1 lessons that empower kids with confidence, movement, and freedom in the water. The 24 hour event brought swimmers together for a non-stop relay challenge, raising vital funds to provide these lessons across the UK. To everyone swimming, supporting, and staying awake through the night: thank you for making a difference. This is what sport is all about.
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zone3official
09/06/25
Blenheim Palace Triathlon delivered everything we love about race season - historic backdrops, electric energy, and a community of athletes pushing themselves to new limits 🏁 As Official Swim Sponsor, we were proud to support one of the UK’s most iconic triathlons. The Zone3 kit was out in force, powered by the passion of our ambassador team and the dedication of every single participant! 👉 Swipe to see our fave visitor of the weekend @blenheimpalacetriathlon
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zone3official
09/06/25
Blenheim Palace Triathlon delivered everything we love about race season - historic backdrops, electric energy, and a community of athletes pushing themselves to new limits 🏁 As Official Swim Sponsor, we were proud to support one of the UK’s most iconic triathlons. The Zone3 kit was out in force, powered by the passion of our ambassador team and the dedication of every single participant! 👉 Swipe to see our fave visitor of the weekend @blenheimpalacetriathlon
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zone3official
09/06/25
Blenheim Palace Triathlon delivered everything we love about race season - historic backdrops, electric energy, and a community of athletes pushing themselves to new limits 🏁 As Official Swim Sponsor, we were proud to support one of the UK’s most iconic triathlons. The Zone3 kit was out in force, powered by the passion of our ambassador team and the dedication of every single participant! 👉 Swipe to see our fave visitor of the weekend @blenheimpalacetriathlon
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zone3official
09/06/25
Blenheim Palace Triathlon delivered everything we love about race season - historic backdrops, electric energy, and a community of athletes pushing themselves to new limits 🏁 As Official Swim Sponsor, we were proud to support one of the UK’s most iconic triathlons. The Zone3 kit was out in force, powered by the passion of our ambassador team and the dedication of every single participant! 👉 Swipe to see our fave visitor of the weekend @blenheimpalacetriathlon
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zone3official
09/06/25
Blenheim Palace Triathlon delivered everything we love about race season - historic backdrops, electric energy, and a community of athletes pushing themselves to new limits 🏁 As Official Swim Sponsor, we were proud to support one of the UK’s most iconic triathlons. The Zone3 kit was out in force, powered by the passion of our ambassador team and the dedication of every single participant! 👉 Swipe to see our fave visitor of the weekend @blenheimpalacetriathlon
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zone3official
09/06/25
Blenheim Palace Triathlon delivered everything we love about race season - historic backdrops, electric energy, and a community of athletes pushing themselves to new limits 🏁 As Official Swim Sponsor, we were proud to support one of the UK’s most iconic triathlons. The Zone3 kit was out in force, powered by the passion of our ambassador team and the dedication of every single participant! 👉 Swipe to see our fave visitor of the weekend @blenheimpalacetriathlon
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zone3official
09/06/25
Blenheim Palace Triathlon 2025 brought together athletes, ambition, and the unmistakable energy of race season. 💥 As the Official Swim Sponsor, Zone3 was proud to support the event which included the British and English Sprint Distance Championships and GB Age-Group Team Qualifier. With athletes of every level pushing their limits and our ambassadors leading from the front, it was a weekend to remember. The rain came down, but the spirit? Unshakeable. The determination? Unstoppable. The atmosphere? Electric ⚡ From first-time triathletes to GB hopefuls, every stroke, step, and smile was a reminder of why we do this. Thanks to everyone who stopped by to chat! And huge kudos to everyone who raced! @blenheimpalacetriathlon
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zone3official
23/05/25
Planning a staycation with open-water swims on the agenda? Don’t hit the road without these 5 holiday essentials that blend performance, comfort, and innovation, whether you're taking the plunge or soaking in the scenery. 🧭 1. Zone3 Waterproof Phone Pouch Stay safe + snap the moment. This buoyant, watertight pouch keeps your phone sealed from the elements while floating beside you for easy access:GPS, safety calls or that post-swim selfie, sorted. 🏖 2. Swim Safety Buoy Not just for visibility, our buoys offer a float to grab hold of when you need a breather in the water, plus are in-water storage for your dry kit and valuables. They're lightweight, eco-conscious, and swimmer-approved for peace of mind. 🕶 3. Waterhaul x Zone3 Sunglasses Sustainably made from ocean plastic and engineered for active wear, these polarised shades reduce glare off the water and keep you looking sharp on swim breaks. 🫖 4. Zone3 Ocean Bottle Hydration with a mission. This vacuum-insulated bottle keeps drinks cold (or hot) and supports ocean cleanup with every purchase. Perfect for post-dip teas or mid-hike refreshment. 🧥 5. Thermo-Tech Changing Robe From freezing lakes to rainy beaches, this super-insulated robe wraps you in warmth while you change. Windproof, water-resistant and cosy enough to live in between swims. 💬 Got a UK swim spot to recommend? Drop your favourite below and let the community know where you’re diving in next 👇
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zone3official
23/05/25
Planning a staycation with open-water swims on the agenda? Don’t hit the road without these 5 holiday essentials that blend performance, comfort, and innovation, whether you're taking the plunge or soaking in the scenery. 🧭 1. Zone3 Waterproof Phone Pouch Stay safe + snap the moment. This buoyant, watertight pouch keeps your phone sealed from the elements while floating beside you for easy access:GPS, safety calls or that post-swim selfie, sorted. 🏖 2. Swim Safety Buoy Not just for visibility, our buoys offer a float to grab hold of when you need a breather in the water, plus are in-water storage for your dry kit and valuables. They're lightweight, eco-conscious, and swimmer-approved for peace of mind. 🕶 3. Waterhaul x Zone3 Sunglasses Sustainably made from ocean plastic and engineered for active wear, these polarised shades reduce glare off the water and keep you looking sharp on swim breaks. 🫖 4. Zone3 Ocean Bottle Hydration with a mission. This vacuum-insulated bottle keeps drinks cold (or hot) and supports ocean cleanup with every purchase. Perfect for post-dip teas or mid-hike refreshment. 🧥 5. Thermo-Tech Changing Robe From freezing lakes to rainy beaches, this super-insulated robe wraps you in warmth while you change. Windproof, water-resistant and cosy enough to live in between swims. 💬 Got a UK swim spot to recommend? Drop your favourite below and let the community know where you’re diving in next 👇
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zone3official
23/05/25
Planning a staycation with open-water swims on the agenda? Don’t hit the road without these 5 holiday essentials that blend performance, comfort, and innovation, whether you're taking the plunge or soaking in the scenery. 🧭 1. Zone3 Waterproof Phone Pouch Stay safe + snap the moment. This buoyant, watertight pouch keeps your phone sealed from the elements while floating beside you for easy access:GPS, safety calls or that post-swim selfie, sorted. 🏖 2. Swim Safety Buoy Not just for visibility, our buoys offer a float to grab hold of when you need a breather in the water, plus are in-water storage for your dry kit and valuables. They're lightweight, eco-conscious, and swimmer-approved for peace of mind. 🕶 3. Waterhaul x Zone3 Sunglasses Sustainably made from ocean plastic and engineered for active wear, these polarised shades reduce glare off the water and keep you looking sharp on swim breaks. 🫖 4. Zone3 Ocean Bottle Hydration with a mission. This vacuum-insulated bottle keeps drinks cold (or hot) and supports ocean cleanup with every purchase. Perfect for post-dip teas or mid-hike refreshment. 🧥 5. Thermo-Tech Changing Robe From freezing lakes to rainy beaches, this super-insulated robe wraps you in warmth while you change. Windproof, water-resistant and cosy enough to live in between swims. 💬 Got a UK swim spot to recommend? Drop your favourite below and let the community know where you’re diving in next 👇
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Z
zone3official
23/05/25
Planning a staycation with open-water swims on the agenda? Don’t hit the road without these 5 holiday essentials that blend performance, comfort, and innovation, whether you're taking the plunge or soaking in the scenery. 🧭 1. Zone3 Waterproof Phone Pouch Stay safe + snap the moment. This buoyant, watertight pouch keeps your phone sealed from the elements while floating beside you for easy access:GPS, safety calls or that post-swim selfie, sorted. 🏖 2. Swim Safety Buoy Not just for visibility, our buoys offer a float to grab hold of when you need a breather in the water, plus are in-water storage for your dry kit and valuables. They're lightweight, eco-conscious, and swimmer-approved for peace of mind. 🕶 3. Waterhaul x Zone3 Sunglasses Sustainably made from ocean plastic and engineered for active wear, these polarised shades reduce glare off the water and keep you looking sharp on swim breaks. 🫖 4. Zone3 Ocean Bottle Hydration with a mission. This vacuum-insulated bottle keeps drinks cold (or hot) and supports ocean cleanup with every purchase. Perfect for post-dip teas or mid-hike refreshment. 🧥 5. Thermo-Tech Changing Robe From freezing lakes to rainy beaches, this super-insulated robe wraps you in warmth while you change. Windproof, water-resistant and cosy enough to live in between swims. 💬 Got a UK swim spot to recommend? Drop your favourite below and let the community know where you’re diving in next 👇
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Z
zone3official
23/05/25
Planning a staycation with open-water swims on the agenda? Don’t hit the road without these 5 holiday essentials that blend performance, comfort, and innovation, whether you're taking the plunge or soaking in the scenery. 🧭 1. Zone3 Waterproof Phone Pouch Stay safe + snap the moment. This buoyant, watertight pouch keeps your phone sealed from the elements while floating beside you for easy access:GPS, safety calls or that post-swim selfie, sorted. 🏖 2. Swim Safety Buoy Not just for visibility, our buoys offer a float to grab hold of when you need a breather in the water, plus are in-water storage for your dry kit and valuables. They're lightweight, eco-conscious, and swimmer-approved for peace of mind. 🕶 3. Waterhaul x Zone3 Sunglasses Sustainably made from ocean plastic and engineered for active wear, these polarised shades reduce glare off the water and keep you looking sharp on swim breaks. 🫖 4. Zone3 Ocean Bottle Hydration with a mission. This vacuum-insulated bottle keeps drinks cold (or hot) and supports ocean cleanup with every purchase. Perfect for post-dip teas or mid-hike refreshment. 🧥 5. Thermo-Tech Changing Robe From freezing lakes to rainy beaches, this super-insulated robe wraps you in warmth while you change. Windproof, water-resistant and cosy enough to live in between swims. 💬 Got a UK swim spot to recommend? Drop your favourite below and let the community know where you’re diving in next 👇
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Z
zone3official
23/05/25
Planning a staycation with open-water swims on the agenda? Don’t hit the road without these 5 holiday essentials that blend performance, comfort, and innovation, whether you're taking the plunge or soaking in the scenery. 🧭 1. Zone3 Waterproof Phone Pouch Stay safe + snap the moment. This buoyant, watertight pouch keeps your phone sealed from the elements while floating beside you for easy access:GPS, safety calls or that post-swim selfie, sorted. 🏖 2. Swim Safety Buoy Not just for visibility, our buoys offer a float to grab hold of when you need a breather in the water, plus are in-water storage for your dry kit and valuables. They're lightweight, eco-conscious, and swimmer-approved for peace of mind. 🕶 3. Waterhaul x Zone3 Sunglasses Sustainably made from ocean plastic and engineered for active wear, these polarised shades reduce glare off the water and keep you looking sharp on swim breaks. 🫖 4. Zone3 Ocean Bottle Hydration with a mission. This vacuum-insulated bottle keeps drinks cold (or hot) and supports ocean cleanup with every purchase. Perfect for post-dip teas or mid-hike refreshment. 🧥 5. Thermo-Tech Changing Robe From freezing lakes to rainy beaches, this super-insulated robe wraps you in warmth while you change. Windproof, water-resistant and cosy enough to live in between swims. 💬 Got a UK swim spot to recommend? Drop your favourite below and let the community know where you’re diving in next 👇
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zone3official
14/05/25
Are you ready for the Arla Great North Swim in June? @zone3official takes you through ‘sighting’ in open water, so you swim in the right direction and don’t zig zag your way around. Practicing sighting before the event will make sure you swim in a straight line and ensures you don’t swim further than you need to on the day. If you’re swimming in the pool, why not grab a bottle and use it as a marker at the end of your lane. Try to lift your eyes or head to look at it every few strokes. If you can practice in the open water, a landmark in the distance is a good marker to swim towards too! #openwaterswimming #zone3 #zone3official #greatnorthswim2025
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zone3official
01/05/25
Introducing the all-new Glide Wetsuit — engineered to help new triathletes and open-water swimmers feel fast, supported, and in control from their first swim to their final stroke. Whether you're stepping into open water for the first time or building confidence ahead of race day, Glide is your perfect entry point. Its performance-enhancing design combines flexibility where it counts, balanced buoyancy, and durable comfort, helping you conserve energy, swim naturally, and stay focused on your goals. Comment 'Glide' for more info sent straight to your DMs.
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zone3official
01/05/25
Introducing the all-new Glide Wetsuit — engineered to help new triathletes and open-water swimmers feel fast, supported, and in control from their first swim to their final stroke. Whether you're stepping into open water for the first time or building confidence ahead of race day, Glide is your perfect entry point. Its performance-enhancing design combines flexibility where it counts, balanced buoyancy, and durable comfort, helping you conserve energy, swim naturally, and stay focused on your goals. Comment 'Glide' for more info sent straight to your DMs.
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