YOUR SLED PUSH
IS FINE.
YOUR TRUNK ISN'T.
Every rep in the gym uses a fixed load. Your nervous system learns to switch off.
TsunaFlow's shifting water resistance forces constant stabiliser recruitment, so you don't fall apart at Station 6.
Free UK delivery · 60-day race guarantee
Built on Science.
Proven in Rehab.
Built for Hyrox.
The Science Behind It
Dynamic resistance didn't come from a gym, it came from physiotherapy rehab, where load has to be unpredictable for the nervous system to recover fully. The principle is established: unstable resistance engages stabilisers that predictable loads switch off. TsunaFlow takes that clinical principle out of the rehab room and puts it where Hyrox athletes actually need it, in the back-half of your event.
Nowhere to Hide
The second your brain predicts a load, it switches your stabilisers off. That's not laziness, that's your nervous system optimising for efficiency. Fine in the gym. Catastrophic at station 6 when efficiency is exactly what's left you. Water shifts with every rep. Every change of direction. Every transition. Your nervous system has no choice but to stay switched on, which is the exact state Hyrox demands on race day.
Built to Progress
Most training tools stop challenging you. You adapt, they become predictable, progress flattens. TsunaFlow scales in two dimensions: weight (1 kg to 25 kg) and complexity (the faster and harder you move, the more the water fights back). The feedback loop never closes. You don't plateau, you get better at controlling something that never becomes controllable. Which is exactly the skill Hyrox rewards.
Why we
actually exist.
We're not here to spin you a fairy tale about revolutionising your training in one session.
TsunaFlow started because we were knackered of watching good athletes train hard for Hyrox and still blow up at station 5. Not because they were unfit, because their kit trained them for a sport Hyrox isn't. Fancy gadgets that look good on Instagram but don't help you hold form on the back-half of a Farmer's Carry at 72 minutes deep.
We wanted honest, immediate feedback. No fancy sensors. Just the raw physics of water to teach your nervous system what your conscious mind can't, how to stay switched on when everything's telling you to switch off.
What started as a frustration is now a collective obsession. Our team works with coaches, physios and UK Hyrox athletes to bridge the gap between the rehab room and race day.
Why we actually exist.
We're not here to spin you a fairy tale about revolutionising your training in one session.
TsunaFlow started because we were knackered of watching good athletes train hard for Hyrox and still blow up at station 5. Not because they were unfit — because their kit trained them for a sport Hyrox isn't. Fancy gadgets that look good on Instagram but don't help you hold form on the back-half of a Farmer's Carry at 72 minutes deep.
We wanted honest, immediate feedback. No fancy sensors. Just the raw physics of water to teach your nervous system what your conscious mind can't — how to stay switched on when everything's telling you to switch off.
What started as a frustration is now a collective obsession. Our team works with coaches, physios and UK Hyrox athletes to bridge the gap between the rehab room and race day.