HIIT timer — 40/20

The pattern

Work

40 s

Rest

20 s

Intervals

8

Get ready

10 s

Total

7:50

Forty seconds of work, twenty seconds of rest, eight times through: two parts work to one part rest, written out as a fixed sequence rather than something you keep in your head.

Every number on this page is editable. Set work to 30 and rest to 30 and you have a different session — the address bar updates to match, so you can send that exact session to someone else.

How a run goes

1. Press start. A ten-second countdown runs before the first work interval.
2. Work for 40 seconds. The timer announces the change and counts the interval down.
3. Rest for 20 seconds. A rest phase follows every work interval except the last one.
4. Eight intervals in all. Eight work phases, seven rests between them.

All interval timers

What this timer does

An interval timer counts work and rest for you so you can stop counting and start moving. Set how long you work, how long you rest, and how many times — the timer handles the rest, calls every change out loud, and shows the whole session as a strip so you always know what is coming.

Time here is measured against the clock, not counted down by a ticker. Put the phone down, pick it up again, and the timer is exactly where it should be rather than a few seconds behind. That sounds like a detail until you have done eight rounds against a timer that drifted.

Every setting travels in the link. Copy the address bar and you have shared your session — no account on either end.

One thing a browser cannot do

When your screen switches off, or you leave this tab, the browser stops the audio. The clock still comes out right when you return, but you will not have heard the beeps in between. We ask the browser to keep the screen awake where it can, and we tell you when it cannot — because a tool that names its limit is more useful than one that hides it.

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