In the pool, the Swimtraxx One tracks 9 parameters: heart rate, lap time, stroke type (automatic detection), stroke rate, stroke count, breath count, turn time, underwater time, and stroke length.

The Swimtraxx One clips onto the right side of any standard silicone goggle strap. The sensor sits at your right temple, where it needs skin contact to measure heart rate.

Any goggles with a standard silicone strap. Goggles with extended visors (like the Arena Cobra series) may interfere with the heart rate sensor — in that case, you can wear the device under a swim cap.

Yes. The Swimtraxx One can be worn under a swim cap, which actually helps ensure consistent skin contact for heart rate measurement.

The Swimtraxx One is designed for pool swimming. While you can wear it in open water, there is no GPS and the device will only record stroke parameters and heart rate as one continuous lap. It is not an open water device.

Yes. The Swimtraxx One is approved by World Aquatics under Rule SW 15.3, making it the only goggle-mounted wearable you can use in official competitions.

Up to 8 hours of continuous tracking. Charging takes approximately 2 hours via the included magnetic charger.

Just 12.7 grams. You won’t feel it while swimming.

No. There is no subscription, no monthly fee, and no premium tier. You buy the device once and all features, including the Swimtraxx Hub app, are free forever.

The Swimtraxx Chrono is a professional-grade digital stopwatch designed for coaches. It features a triple-line LCD display for simultaneous tracking of lap, split, and total elapsed time, 100-lap memory, built-in pacer/metronome mode, and a water-resistant, shock-resistant design.

Yes, the Swimtraxx Hub app is 100% free forever. No subscription, no in-app purchases, no premium features behind a paywall.

Swimtraxx Hub is available on iOS, iPadOS, and Android. There is also a web version, though the web version does not support offloading data from devices.

No. You can use the Swimtraxx Hub app for workout planning and training management without owning a Swimtraxx device. The device unlocks additional features like automatic swim tracking and real-time heart rate data.

Yes. Swimtraxx Hub supports Strava integration, so your swim sessions are automatically synced.

Yes. Free shipping on all orders over €99. Detailed shipping information is provided when your order is confirmed.

We ship worldwide. Specific shipping zones and rates are calculated at checkout based on your delivery address.

We accept all major credit and debit cards through our secure checkout.

You can return your order within 14 days of delivery for any reason, no questions asked. Full details are in our Refund Policy.

Contact us through our contact page with your order number. You do not need to give a reason. We will confirm the return address and provide any instructions you need.

Yes. Every product comes with a 2-year guarantee. See our Warranty page for full details.

The Science of Winning is written for coaches, sport scientists, and serious swimmers who want to understand the scientific principles behind training methodology. It’s based on over 40 years of research and more than 150 Olympic gold medals coached using these methods.

Prof. dr. Jan Olbrecht, one of the world’s leading authorities on swimming training methodology. His work has influenced multiple Olympic coaches worldwide.

The Science of Winning is available as a physical book, shipped directly from our warehouse in Belgium.