SwimLean began in a 25-yard pool in Birmingham and a question two founders couldn't stop asking: why does no one teach adults to swim for fat loss? Eleven years later, it's a method, a research collaboration, and a 23-person care team.
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SwimLean is not a content brand, an app, or a course library. It is a clinically framed aquatic protocol — co-built by someone who raced at the elite level and someone who has spent her career measuring what the body actually does in the water.
Co-founder · Former national-team swimmer · Head of Method
Kate swam competitively for 18 years, including four seasons with the British national squad. After retiring from racing, she spent a decade coaching adults who wanted to lose weight without the joint damage she'd seen derail other athletes. She co-founded SwimLean in 2014 to turn that coaching practice into a scalable protocol.
ACE-certified · 22 years in water · 8,400+ hours of 1:1 coaching logged
Co-founder · Exercise Physiologist · Head of Research
Helena holds a PhD in Exercise Physiology from the University of Birmingham and has authored 14 peer-reviewed papers on aquatic training and adult metabolic adaptation. Her lab work — repeated across three university collaborations — is the evidence base underneath every SwimLean protocol.
PhD Exercise Physiology · 14 peer-reviewed papers · 3 university syllabi
Every SwimLean coach is ACE- or NASM-certified, every nutrition protocol is reviewed by a registered dietitian, and every medical claim passes a standing advisory board. The members who message us at 11pm are answered by the people on this page.
Every coach holds a current ACE or NASM personal-training certification plus an internal 80-hour SwimLean aquatic-method qualification. They review technique video, pace progressions, and weekly check-ins.
Our RDs build the protein-forward, sustainable eating templates that complement the swim protocols — no crash diets, no macro shame, no meal-replacement upsells.
Chaired by Dr. Marcus Levin, MD (Sports Medicine, UCSF), the board reviews joint-safety claims, contraindications for osteoarthritis, and every health-outcomes survey.
Behavioural coaches, video-analysts, partner-pool coordinators, and a member-support team that responds within four hours, seven days a week — the people who turn a protocol into a relationship.
In 2013, Kate Voss was coaching a 52-year-old client through her third failed attempt at losing 30 pounds. She'd tried running (left knee), bootcamp (lower back), and calorie restriction (energy crash). Kate kept returning to one observation: in the water, her client could move hard for 45 minutes without pain, and her resting heart rate recovered in a way that didn't happen on land.
She brought the question to Dr. Helena Marsh at the University of Birmingham: could a structured aquatic protocol actually match the fat-oxidation rates of high-intensity land training — without the orthopedic cost? Helena's lab ran three years of comparative trials on adults aged 35–68, measuring subcutaneous fat loss, VO2 adaptation, and joint-loading markers against matched running and HIIT cohorts.
The result — published across 14 peer-reviewed papers between 2016 and 2025 — is the SwimLean method: 45-minute pool sessions engineered to keep heart rate in the 65–80% max range for the majority of the work, paired with breath-controlled drills that maximise lipolysis without the cortisol spike of high-intensity intervals. It's not about swimming faster. It's about swimming specifically for fat loss, in a way the body can sustain for 12 weeks and beyond.
That research collaboration is still active. Every protocol update we ship passes through the same Birmingham lab review pipeline it started in.
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Featured as the joint-friendly alternative to running — and ranked #1 Aquatic Weight Loss Program by Shape Magazine in 2022, 2023, and 2024.
