Do you need an Apple Watch for Japanese walking?
No. The method needs a way to know when 3 minutes is up, and nothing else. The participants in the original research had no smartwatches; the study predates the Apple Watch by eight years. So if the question is "can I start without one?", start today with your phone.
The more interesting question is what a watch genuinely adds if you have one, versus what is marketing. Full disclosure before we get into it: we make Japanese Walking: Step Counter, an iPhone and Apple Watch app for this method, so we have opinions and an interest. We will keep the two separable.
What a phone alone does perfectly well
- Timing. Any interval timer handles 3:3 x5. A guided app adds voice prompts through headphones so the phone stays in your pocket. Ours also puts the phase countdown on the Lock Screen and in the Dynamic Island, so a glance at the phone tells you where you are without unlocking anything.
- Steps, distance, calories. Modern phones track these adequately for walking as long as the phone is on you.
- The actual workout. The talk test measures briskness with no hardware at all: short sentences only during fast phases. This is what the study participants effectively relied on day to day.
What a watch genuinely adds
Three things, in order of usefulness:
- Haptic phase cues. A tap on the wrist when the phase changes means no headphones, no pocket-checking, no clock-watching. It sounds trivial. It is the single biggest quality-of-life difference, especially on a treadmill or walking with someone.
- Real-time heart rate. The honest measure of whether your brisk phases are brisk. The gap between your fast-phase and slow-phase heart rate is the clearest signal that you are doing intervals rather than one long moderate walk, and wrist heart rate makes that visible live and reviewable afterwards.
- Phone-free walks. With a full Watch app, the phone stays at home. Worth more than it sounds once walking is a daily habit.
What is nice to have but not necessary
Fitness analytics (heart-rate recovery, pace efficiency, VO2 max estimates), trend charts, ring-closing. These are motivating for some people and noise for others. None of them changes what happens on the pavement. If you enjoy numbers, they help you track progress over months; if you do not, skip them without guilt.
A note on cost, since this is usually the real question
You do not need to buy a watch for this method, and we would rather say that plainly than imply otherwise. If you already own an Apple Watch, one thing worth knowing about our corner of the market: most interval walking apps put their Watch app, or heart-rate features, behind a subscription. We deliberately did not. The complete Watch app, with live heart rate, haptic cues and voice guidance, is in the free tier of Japanese Walking: Step Counter, because charging monthly for a timer on your wrist felt wrong. The paid tier is analytics and customisation, not the basics.
If you are choosing between a dedicated app and building intervals in Apple's own Workout app, that comparison gets its own honest article.
Bottom line
Phone: entirely sufficient, start now. Watch: meaningfully nicer, mainly for the wrist taps and the heart-rate honesty. New watch purchased specifically for walking intervals: unnecessary, whatever anyone's marketing implies, including ours.
About the app
Japanese Walking: Step Counter is a free iPhone and Apple Watch app made by Red Kite 9, a one-person studio in the UK. The full guided 3x3 walk is free, including the complete Apple Watch app with real-time heart rate, haptic phase cues and voice guidance. No subscription needed for any of that.