Interval Walking Timer
3.6 km/h
Ready? Tap play to begin
The rhythm beeps play from a continuous audio track, so they keep sounding when the screen locks and they play through the iPhone silent switch. Use the lock-screen media controls to pause or stop. A phone call or a very long lock can still interrupt iOS audio — J-Walk resyncs the timer as soon as you return. Android voice availability depends on the system voices installed on the device.
3D breathing guide
Ready to breathe
Slow rhythm: 4 seconds in · 6 seconds out
🫁 Breathing zone & ☀️ D3 synthesis
Zone 1 · Recovery breathing
In 4 · Out 6 (nose only)
Long exhale switches on the parasympathetic system and clears lactate before the next fast block.
☀️ D3 synthesis active
Sun is high enough for UVB. 15–25 minutes with forearms and face uncovered covers a typical daily need. Do not burn.
Join the J-Walk.app longevity community
📍 Your route (OpenStreetMap)
Waiting for GPS…Steps are counted by your phone's motion sensor and distance by GPS — if you sit still, nothing counts.
Fingerprint readers do not expose pulse data to websites. This uses the rear camera and flash as a wellness estimate only; it is not a medical device.