Meet Your New Assistant Coach

The Ultimate Swim Platform For Coaches

Main benefits of using the product

AI backed plans for individual training plan for your swimmers

Personalized energy zones built around each athlete’s unique physiology, make it simple to individualize your training, give personalized feedback and build a comprehensive, confident picture of each athlete.

Science-Backed Fitness Test

Phlex’s 3-minute test is backed by the latest research in sports science. It accurately measures progress, and establishes energy zones. Get efficient automated benchmarks for each athlete.

Maximize Meets Performance

Maximizing every athlete’s performance leading up to a swim meet also means the appropriate training plan – and rest. Phlex takes out any guesswork, so you’re confident your athlete will perform at their pinnacle.

Identify Overtraining

Monitor your athletes when scaling the training load, and collect perceived exertion after every workout via the Phlex Swim App. With this advantage, you’ll spot changes in performance without hesitation – and stop overtraining in its tracks.

World Changing Partnerships

A pillar of the olympic movement, FINA controls development of aquatic events across the world.

Our partnership brings the very latest science-backed technology to the global swimming community. It ensures athletes and coaches have the optimum tools and knowledge to perform at their best.

Fina logo
Fina logo
Fina logo

How does it work?


Your athletes use a Phlex device powered by Polar to track their swims.


Data from each swimmer synchronizes effortlessly with your coach platform – giving easy access to meaningful information about your athletes’ performance.


No more guesswork. Highest accuracy data helps you decide what works best for each swimmer – to maximize their full potential.

1. Use the sensor to perform the 3 minute test/or swim regular workouts for 2-3 weeks

2. Establish the personalized energy zones

3. Use the energy zones to guide and anylyze training

4. Review critical technique, fitness and load data to assess training

Track + Analyze – On Deck or Remote

As a coach, you’ll know the difficulty of juggling multiple athletes—without enough resources.

Your dashboard unlocks a world of support usually only open to well-funded national teams. Say ‘hello’ to your new personal sports scientist.


The combination of a lightweight Polar sensor with state of the art Phlex machine learning technology, sets a new standard in reliability – and automation. 


Your dashboard provides a quick overview in key training areas for the team, while athlete pages allow you to take a deep dive into individual athletes.  


Develop your training programs in response to 3 crucial baselines: Technical Efficiency, Fitness (heart rate and energy zones), Training Load and Fatigue

Unlock The Phlex Algorithm

FACT: Two athletes competing in the same event can have drastically different physiologies.

Properly established energy zones are key to maximizing training efficiency.

These crucial benchmarks must be tested frequently which requires precise, accurate testing protocol. 

Athlete Perspective

Get your athletes on board with your vision. Personalized feedback and individualized training make athletes more engaged in everyday training. The enhanced communication brings the team closer together.

Improve your team results

Phlex Team Platform

Save 40%

$159 /year per athlete

Join the Waitlist

Be our new success story

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Abbas Karimi - Para Olympian, World Championships Medalist

Before Phlex, there was never an option that provided me the ability to track my training with so much detail. I find myself checking my scores every day after training. Seeing my improvement so simply defined has been a physical and mental relief.

Abbas Karimi - Para Olympian, World Championships Medalist
Alia Atkinson - World Champion

Phlex helps me push. I get feedback that shows me what to work on next.

Alia Atkinson - World Champion
Calvin Justus - Swimming Influencer

Phlex accurately tells me what my heart rate was throughout my session. It breaks down the sets and gives me times for each part of the workout.

Calvin Justus - Swimming Influencer
Cody Miller - Olympic Medalist, Swimming Vlogger

I use Phlex to monitor my taper because it tracks everything I’m doing leading up to a meet. I look at my stroke trends and heart rate on all pace sets.

Cody Miller - Olympic Medalist, Swimming Vlogger
Dan Wallace - Olympic Medalist

Phlex allows me to do things I haven’t done before. It brings joy.

Dan Wallace - Olympic Medalist
Darra Torres - 5-time Olympian and Bestselling Author

Swimming has always been a love for me. I think it’s even more so now because I don’t have to keep track of what I’m doing. Phlex does the work for me, making swimming much more fun.

Darra Torres - 5-time Olympian and Bestselling Author
Harold Primat - Former Formula Driver, Triathlete

Phlex keeps detailed recordings of all my swimming sessions. Nothing is missed, and I know exactly what strokes I did during each workout. It also shows me the intensity of my sessions and gives me the total of my monthly distance. I can swim fully relaxed, knowing Phlex does the counting for me. I am now fully addicted and cannot imagine swimming without my device anymore.

Harold Primat - Former Formula Driver, Triathlete
Jason Lezak - Olympic Gold Medalist

Phlex is the perfect tool for educating yourself about your body. Once I gained a better understanding of myself, my training approach changed. When I was a kid, there wasn’t much thought put into what we did in practice. We focused on repetitions instead of the details that would really make us faster in competition. Later in my career, I started to pay more attention to stroke data, physiology, and recovery. It became less about just doing and more about improving my race weaknesses.

Jason Lezak - Olympic Gold Medalist
Jazz Carlin - Olympic Medalist

Distance swimming has always been a huge part of my life. What I love most about Phlex is that you always get insightful feedback. Reading through pace charts and seeing my overall improvement so clearly has really changed my relationship with training.

Jazz Carlin - Olympic Medalist
Marty Hendrix - Masters Coach

As a USMS coach and a Masters swimmer myself, I know how important it is to maintain a safe training environment for my athletes, regardless of age. Phlex gives me the ability to monitor my athletes from a distance or work closely with those who have health concerns. It’s given me peace of mind and more confidence to provide each individual with their own version of training.

Marty Hendrix - Masters Coach
Paul Pesqueira - Fitness Swimmer

I love the data and the feedback that helps you improve your performance. It’s remarkable. I have been swimming for many years, from High School to Masters Swimming and Phlex has allowed me to work on various aspects of my swimming. I would encourage any swimmer from elite to novice to try this product.

Paul Pesqueira - Fitness Swimmer
Ron Aitken - Olympic Coach For Team USA

I’ve been using Phlex technology every day for over 2 years. What we love about it is the ability to personalize the training for each athlete and see how they are progressing throughout the week. It also gives me the right data to monitor if I’m not overtraining my swimmers and when to give them opportunities to recover.

Ron Aitken - Olympic Coach For Team USA
Stephan Barmentloo - Fitness Swimmer

I'm a recreational swimmer and not a member of a swim club. Phlex provides me with the incentive to go swimming on a regular basis. Phlex tracks every lap, movement, and heartbeat and converts it into a wide array of statistics that can be reviewed after every session. Comparing sessions and seeing the progress I make on a physical but also technical level gives me a lot of motivation to keep going at it and live healthily.

Stephan Barmentloo - Fitness Swimmer
Vincent Lam - Age Group Swimmer’s Parent

The precision of Phlex enabled us to train our son under the USRPT program for the past few years. The cloud service enabled us to monitor our son's progress, whether he trained with his school swim team or us. The heart rate monitor allowed us to modify the training program in real-time if needed, a valuable tool for any swimmers.

Vincent Lam - Age Group Swimmer’s Parent

Get Back To What You Do Best


Here at Phlex, we know being a coach means way more than just creating training programs. You inspire, and build deep relationships based on trust, respect and understanding. Our platform saves you the time and energy to do exactly that.


Phlex is your all-in-one Assistant Coach and Sports Scientist. All data syncs with an athlete’s phone and appears processed in the team platform. Gain meaningful insights into your athletes at weekly, monthly or quarterly intervals, all in one place. 


Working with teams of up to 50 swimmers, it can be impossible to gather enough reliable data to give personalized feedback. Now, with access to accurate, individual, and automated data you can personalize your vision – and get the most out of each swimmer.

Measure Every Stroke 

  • Phlex Team Platform is compatible with the head-worn Polar Verity Sense sensor.
  • Polar is the gold standard of sensors. Clipped onto your goggle strap, the lightweight sensor holds constant contact with skin above the spine, producing exceptional, accurate data.
  • High-quality data delivered by Polar enables in-depth analysis performed by Phlex algorithms.

Frequently Asked Questions

Can I use the app without a membership?

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Yes, we offer free trials of every membership tier. For swimmers, we offer a 14-day trial of the entire experience – and then provide a feature-limited version. (To see data in the platform, you’ll need to upgrade to a paid ‘Pro’ account.)

For coaches, those accounts are free.

Can I wear the Polar Verity Sense in the ocean?

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Yes, the Polar Verity Sense is safe to wear in nearly all water environments.

Does Phlex connect with Strava?

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Yes, you can connect the Phlex Swim app with your Strava account.

How do I record a workout with the Polar Verity Sense?

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Simply turn on the Verity Sense and start the workout by pressing and holding the button on top. 

Enjoy your swim…

And finally, press and hold the button again, to end the workout and turn it off. It couldn’t be simpler!

How should I store the Polar Verity Sense when not in use?

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We recommend using the included mesh storage bag to keep your Verity Sense and Goggle Clip together.

Is Phlex only for professional swimmers?

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Absolutely not! Whether you swim for fitness, the thrill of competition or love of gliding through the water, ask yourself these questions: Are you an ambitious swimmer? Do you want to get the most out of each and every swim? And would you like to become faster, more agile, more intelligent with every stroke? 

If your answer’s ‘yes’ then phlex is for you!

Is my watch compatible?

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You can check the most up-to-date list of compatible devices here.

My watch already tracks swimming. Why should I use Phlex?

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Good question! Truth is, the watch market has become saturated with high-quality hardware from a wide range of manufacturers – but the swimming experience with these devices is severely lacking…

First, they lack accuracy in tracking the foundational parts of a swimming routine, such as workout times, distance, or workout breakdown. (And chances are, they will completely ignore core stroke metrics such as rate, distance per stroke, and stroke efficiency).

Secondly, most apps track general metrics – they do not go into the multi-layered nature of swimming (and nor are they designed by people who love the sport as much as we do!) 

Most importantly, they do little to provide you, the swimmer or coach, with any kind of actionable insight to build and improve upon.

Tell me more about the Phlex Membership…

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We have 3 levels of membership. The first, ‘Phlex Membership’ offers full access to the Phlex Swim mobile app. Billed monthly, you bring your own tracking device. 

The second, ‘Phlex Pro’ is an annual premium subscription that includes a Polar Verity Sense (our recommended device for the most accurate and detailed experience). This membership also enables you to connect with a ‘Coach Account.’

The third, ‘Phlex Coach’ is a fully personalized experience for every swim coach. Read more about that here

What is the difference between an annual ‘Phlex Pro’ membership and a monthly ‘Phlex’ membership?

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The ‘Pro’ tier is an annual-only membership that includes the Polar Verity Sense free of charge when you sign-up. A ‘Phlex Pro’ membership is also required to send data to Coach Accounts. The ‘Phlex’ membership is a monthly subscription that gives full access to the mobile app and is compatible with all the devices found here.

Track Your Swim

Analyze your real-time metrics and adjust your swimming


  • Calories
  • Max Heart Rate
  • Average Heart Rate
  • Lap Time
  • Time
  • Splits


  • Readiness Score
  • Training Zones
  • Fitness Tests
  • Technique Progress
  • Stroke Efficiency
  • Training effect


  • Stroke Recognition
  • Distance Per Stroke
  • Stroke Rate
  • Stroke Index
  • Kick Recognition


  • Set Recognition
  • Set Specific Heart Rate
  • Set Breakdown
  • Drill Detection
  • Interval Detection

Power Up Your Coaching with the Next Level Swim Platform, Trusted by Professionals

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