Connected Swim Training
4.6 427 reviews on our first swim trainer

ZWIM Smart Trainer

For triathletes who are done with “just surviving the swim”.

The swim gets better with reps. ZWIM gives you the extra reps between pool days — 15 minutes at home, real resistance, live feedback on your stroke. No pool hours to work around.

Real data to track from week one
For the first time, your stroke has a number. Propulsive Watts measure the power and efficiency of every pull.
A session you want to repeat
A 3rd or 4th pool session isn't realistic. This is, 10-35 minutes at home, stroke as controller, workouts and targets waiting.
Stop starting over every pool day
Keep the feel alive with two short sessions in between, and the catch is waiting the moment you hit the water.
ZWIM Smart Trainer £349
What's in the box
ZWIM Bench 2.0 Built-in pump · Stabilising Base ZWIM Smart Paddles Patent-pending 3 Propulsion Bands LVL 1–3 · easy, endurance, power Door anchor + loop No drilling, no tools USB-C charger Battery life: 150 km at 2:00 /100m zwim training plan Your first 30 days, mapped
Choose your membership
Quantity 1 trainer + 1 membership per step.Gift or group order? We’ll email you to assign memberships. 1
ZWIM Smart Trainer £349
ZWIM Membership · 15 months for 12£99
ZWIM goggles + cap · worth £65Included
Delivery · US and UK Free
Due today £448
Your 15 months start the day you activate your ZWIM Smart Trainer.
Takes you to secure checkout. You see the full order before you pay. Questions first? Call +44 (0)207 846 0169, Monday to Friday, 9 to 5 UK.
30 days risk-free at home Cancel for a full refund before it ships. After delivery, train on it for 30 days. If it’s not for you, send it back for a full refund. Pause or cancel later and the trainer still works, with a basic dashboard for your data.
First 100 ship 30th November 26. Batch 2 ship end of 2026.
The game, the world and every loop in it Structured ZWIM workouts, challenges, and Free ZWIM Live Propulsive Watts, stroke rate and left and right balance Post-session review, full history and personal bests Leaderboards, ghost players and the ZWIMMER community Every update, new loop and new feature as it ships
7.4×More likely to feel faster9+ a month between pool days, against none. 61% against 8%. 495 surveyed, self-reported.
20,000+SwimmersTrained on our first swim trainer.
4.6 / 5RatingFrom 427 published reviews.
LET'S BE HONEST ABOUT THE SWIM

YOUR PACE ISN'T MOVING, AND IT'S NOT FOR LACK OF EFFORT

Getting faster in the water comes down to frequency, and frequency means more pool time. But how do you fit another session in when your week has no slots left? That's the problem ZWIM was built to solve.

Swimming faster takes skill and swim-specific endurance, and both come from repeating the movement.

The feel you built fades between pool days, and every session is spent starting over. The pace sits still. The progress stalls.

ZWIM trains propulsion, the phase of your stroke that generates speed. Now the feel doesn't fade. 15 minutes at home, 2 to 3 times a week, and owners of our first trainer were 7.4× more likely to feel faster (self-reported). You feel the difference from the first session; strength builds over 4 to 8 weeks.

No drive, no lane, no wet kit in the car. Just ZWIM at home between pool days. You arrive at your pool sessions switched on. And the pace that sat still, starts to move.

More propulsion, less drag
What it gives, and what it asks
01 What you get Feel faster, activated and switched on in the water, and in your next race.
02 How likely Owners of our first trainer who trained around 15 minutes, 2 to 3 times a week, were 7.4× more likely to feel faster. Self-reported.
03 How fast Activated in 2 to 3 sessions. Technique has shifted in fewer. Swim-specific endurance and power in 4 to 8 weeks.
04 What it asks 15 minutes at home, 2 to 3 times a week. No drive, no lane, no kit to pack.
How it works

Your stroke is the controller.

Never-before-seen live data on your stroke, the moment you make each pull. ZWIM shows you what's working as it happens, and turns it into a game.

01 you are the engine and the input You pull against real resistance from the ZWIM Bench 2.0 with the propulsion bands.
02 The ZWIM Smart paddles read every pull They catch what you can't feel: how much of your effort became propulsion, and how much was wasted.
03 your Power and efficiency, in one number It's a single score you can read at a glance, live as you pull, climbing as you improve.
04 The game responds to how you move Push and it responds; stop and it waits. Your stroke is the only input.
What you see

THE POOL GIVES YOU A PACE AT THE END. ZWIM GIVES YOU POWER, EFFICIENCY AND BALANCE ON EVERY PULL.

During
Every pull, scored as it happens
Propulsive WattsRaw powerEfficiencyWasted wattsLeft / right balanceStrokes per minuteZWIM PaceDistanceTime
After
The session, and the months behind it
Power curveSession analyticsHistoryPersonal bestsProgress over time
Propulsive Watts scores power and efficiency together, across the propulsion phase. The paddles do not measure kick, rotation or breathing.
Athletes behind ZWIM

“ZWIM BENCH 2.0. MUCH MORE STABLE. MUCH BETTER.”

Three Bianchi Pro Triathlon Team athletes trained on ZWIM for the first time in Mallorca. Kieran Lindars has helped shape the hardware, workouts and game since 2020. He is ZWIM Performance Coach, sponsored athlete, shareholder and advisor. Watch all four.

Four clips · sound on to listen
Miguel Hidalgo Pro triathlete 01
Finn Grosse-Freese Pro triathlete 02
Daisy Davies Pro triathlete 03
Kieran Lindars ZWIM Performance Coach · sponsored athlete · shareholder and advisor since 2020 04
Bianchi Pro Triathlon Team Official ZWIM partner Bianchi Pro Triathlon Team train on ZWIM between pool days.
Everything you get

ONE BOX. ONE MEMBERSHIP. TWO GIFTS FOR THE FIRST 100 ZWIMMERS.

The ZWIM Smart Trainer: paddles, bench and bands
In the box
ZWIM Smart Trainer
ZWIM Smart Paddles. They measure every pull and turn it into Propulsive Watts. ZWIM Bench 2.0. With a built-in Speed Pump. Up in 60 seconds. 3 Propulsion Bands. Easy recovery through to sprint. Door anchor, charging cable and quick-start guide. No drilling.
A phone or tablet is not included. Anything from 2020 onwards works.
The ZWIM game responding to a pull
The ZWIM Experience
The membership
The game. The world and all the loops in it, driven by your stroke. Workouts, Challenges and Free ZWIM. Follow a structured session or ZWIM it your way. Propulsive Watts, live. Your power and efficiency scored on every pull. Your history. Every session logged, so you can watch the numbers climb.
The hardware works without a membership. Membership is what makes it a connected session.
Limited edition ZWIM swim goggles and swim cap
Founding 100 ZWIMMERSWorth £65
Two gifts
Limited edition ZWIM goggles. Founding release, not on general sale. ZWIM swim cap. Ships in the same box. A spot on the Founding Wall. The Founding Wall. Opt out any time.
Founding Members 001–100 on the annual plan. Included at no extra cost.
Between pool days

7.4× more likely to feel faster

Swimmers who trained 9+ times a month between pool days: 61% felt faster in the water. Among those who did none, it was 8%.

How much more likely each group was to feel faster
Sessions a month None 1–2 1.7×3–4 3.4×5–8 5.2×9+ 7.4×
Compared with those who did no sessions between pool days, where 8% felt faster.
495 owners of our first swim trainer, self-reported. Not a measured performance test. Which way it runs. Swimmers who felt faster may simply have trained more in the water as well, and those who trained more may have been more motivated to begin with.
THE PROBLEM WITH DRYLAND SWIM TRAINING

Dryland swim training works. But HABIT WAS HARD. ZWIM changes everything.

Look at that data again. Train about twice a week between pool days and you were 7.4× more likely to feel faster. Almost nobody got near that. That is not a kit problem. Dryland training on its own gives you no reason to come back. That is what we set out to fix with ZWIM.

What dryland swim training normally asks

Set it up. Work out what to do. Do it with no feedback. Have no idea if it worked. Then find the will to do it all again on Thursday.

It asks for motivation it does nothing to supply.

WHAT MAKES ZWIM STRUCTURALLY DIFFERENT
It is the opposite of boring. A world to move through, a route to chase, a session that fights back. Nothing like counting lengths. Something to aim at, every time. Structured workouts and challenges. You are chasing a target, not filling twenty minutes. You get rewarded for turning up. XP, achievements and rewards that stack the more you train. Progress you collect, not just feel. You watch yourself get better. Your Propulsive Watts climbing over weeks. Every session logged, and shared if you want it.
Where it fits

Your pool days stay exactly where they are.

The pool is where you swim. ZWIM takes the days in between, the ones that were never going to be pool days anyway. No drive, no lane, no second shower. Up in 60 seconds, training in 3 minutes. 10 to 35 minutes, at home. Use it to start your day, before the bike, or during your lunch break.

Before breakfastBefore the school runLunch breakBrick sessionPain cave triHotel room
The setup

Up in 60 seconds. Training in three minutes.

No tools. No drilling. No spare room. If you can lie down with your arms out, you have enough space.

01 Inflate the bench The built-in Speed Pump does it in about 30 seconds. Nothing to find, nothing to plug in.
02 Anchor the bands The door anchor goes over any door. No tools, no drilling, no marks left behind.
03 Pair and ZWIM The paddles wake up, the app finds them, and the first ZWIM starts.
Floor space Lie down, arms out Anchor height 90 to 120 cm · 3 to 4 ft TOTAL Weight 4 kg · 9 lb, packs away Storage Fits a backpack
Your height  
150 cm195 cm
ANCHOR ANYWHERE 130 cm 90 cm
 
130 cm / 4'3"
Propulsion Bands taut Anchor anywhere 90–130 cm
Anchored to
    × 130 cm / 4'3" wide
  Change resistance: slide further from the anchor for more, closer for less.
 
 
Being built right now

The first hundred are built by hand. Not prototypes.

We're in production as you read this. Each of the first hundred units is assembled by hand, calibrated, and checked before it's packed in the box.

These are not alpha units and they are not beta units. They are the final product. You are early, not a test subject.

Tooling and manufacturing SOPs, signed off Paddle calibration on every single unit Quality checks by hand before packing The first hundred assembled by hand, in order
Straight answers

What is live, what is close, what is on the roadmap.

You are paying up front, so you should know exactly what you are getting on day one and what you are betting on. Here it is, with nothing hidden in a footnote.

The game and the loops The world, the routes and the sessions, driven by your pull.
Propulsive Watts, live Power and efficiency on screen while you train.
History and personal bests Every session saved. The number tracked over weeks.
Workouts and Free ZWIM Structured sessions, or swim a loop your own way.
Strava connection Being built now. If it is not on Strava it never happened, and we agree.
Leaderboards and ghosts Semi-multiplayer. Real times from real ZWIMMERS to chase.
Live multiplayer racing No date yet. Funded by how fast the community grows.
Group ZWIMs Train with other people at the same time. Wanted, not promised.
CIDESD research Research into transfer, part-funded by us. We will publish what it finds.

Tell us what is working and what is not, and it changes. Fast. The routes, the sessions, the numbers on screen — the first hundred shape all of it, and we will keep asking.

The more ZWIMMERS training, the sooner live racing and group sessions land. You are not buying a finished product. You are getting in early enough to decide what it becomes.

Shipping

Where we ship, and what it costs.

United Kingdom Free Founding members. £15 on monthly.
United States Free Founding members. $20 on monthly.
EU, Australia + Canada TBC Rates confirmed before launch.
Rest of world TBC Rates confirmed before launch.
Founding members ship free to the UK and the US. If duties apply where you are, you see them at checkout before you pay, not in a letter afterwards. Every unit ships from our own stock, in the order it was reserved.
30 DAYS RISK-FREE AT HOME

Train on it for a month. If it’s not for you, send it back.

You get a full refund for the ZWIM Smart Trainer and your membership. No questions asked.

Before it ships Cancel for any reason. You get a full refund for the trainer and membership.
30 days at home Set it up. Train on it. Sweat on it. If it’s not for you, send it back.
Two-year warranty Your hardware is covered against manufacturing defects. A real person answers every email.
Free returns under the published terms for your region.

The details.

Bench dimensions 35x50x80cm - 14x20x31in
Space needed About enough floor to lie down with your arms out.
Setup time Bench up in 60 seconds. Training in under 3 minutes.
Anchoring Any door or solid fixture. Door anchor included, no marks, no drilling.
Resistance 3 Propulsion Bands, LVL 1 through LVL 3.
What the ZWIM smart paddles read Propulsive power, left and right balance, efficiency through the propulsion phase.
Battery life 150 km or 93 miles, around 6,000 lengths of a 25 m pool at 2:00 /100 m pace. USB-C charging included.
Charging USB-C, one cable for both Smart Paddles.
Connection Bluetooth to your phone or tablet.
Devices Works with any smartphone or tablet running iOS 16 or Android 12 or newer.
The Smart Paddles read power, left and right balance, and efficiency through the propulsion phase. They do not measure kick, rotation or breathing, and we do not claim to.

The questions you are actually asking.

Technique needs repetition to hold. It cannot survive days of nothing. 4 days off and the movement dulls. That is why the start of a swim feels like starting over. ZWIM keeps the pull alive between pool days, so you arrive switched on. Research with CIDESD is underway. We part-fund it, and we will not claim proven transfer until it lands.

£349 for the trainer, plus your first membership. On annual that is £99, so £448 today, with free shipping. You get 15 months for the price of 12. Your membership clock starts when you activate the trainer, not today. You pay nothing for the wait.

The first 100 trainers ship by the end of November 2026. The next batch ships by the end of 2026. If a date moves, we email you. You can take a full refund at any point before yours ships.

Then you have lost nothing. Change your mind before it ships and you get everything back, hardware and membership together. Once it arrives you get 30 days to train on it. Not look at it. Train on it. Sweat on it. If it is not for you, send it back and we refund all of it, membership included. The only thing you can lose here is the time you spend trying it.

Yes. The trainer is yours to keep and it works. Membership is what makes it connected. That is the game, the workouts, the live numbers and your history.

We train the propulsion phase, which is where propulsion comes from, and we do not simulate the rest of the stroke. Breathing is actually freer on the bench, so you can hold form longer than you can in the water. Kick and rotation stay pool work, and ZWIM is what stops your pool time being spent rebuilding a catch that faded since last week.

Not yet. The team is building it now and we intend to have it live before the first trainers ship. If it is not on Strava it never happened, and we would like your ZWIMs to have happened.

Today you get leaderboards and ghost players, so you are racing real times rather than an empty world. Live multiplayer racing and group sessions are on the roadmap without a date. The faster the community grows, the faster we can fund it.

Enough floor to lie down with your arms out, and a door or a solid fixture to anchor to. The bench is 35 by 45 by 80 centimetres. Nothing gets drilled into a wall.

The bench is up in about 30 seconds using the built-in Speed Pump. Paddles connected and training in under 3 minutes from cold.

No, and we would not want it to. The pool is where you swim. ZWIM is for the days a pool session was never going to happen.

Any smartphone or tablet running iOS 16 or Android 12 or newer.

ZWIM Smart Trainer · Founding 100

You’ve spent years “just surviving” the swim. That ends now.

Everything in the box is yours to keep. 15 months of The ZWIM Experience for the price of 12, locked at £99 while you stay annual. ZWIM Goggles and cap for the first hundred.

Full refund before it ships 30 days to train on it Free shipping and returns 2-year warranty Ships end of November 2026
Pre-orders open soon
ZWIM Connected Swim Training
£448 ZWIM Smart Trainer + Annual Membership Pre-order now Pre-order now Free shipping · ships 30 Nov 26