40 s / 20 s × 8 Timer

40 s / 20 s × 8 preset: 40 s of work, 20 s of rest, 8 rounds. Press Start (or Space); you can still change the values before starting.

Forty seconds of work and 20 seconds of rest is the classic ratio of bodyweight circuit classes: enough time to do 10 to 15 reps with control, then a short transition to the next station. Eight rounds take 8 minutes.

1. Set work and rest – Type the work and rest time in seconds and the number of rounds, or pick a preset below. Tick “Repeat” for an endless loop.
2. Start – Click Start or press Space. The current phase and round number show above the clock, and a short beep sounds during the last 5 seconds of every phase.
3. Finish – After the last round the alarm chosen in Configure plays. Pause stops the countdown, Reset returns to the settings.

The timer keeps working in a background tab and after a page reload. Sounds are generated in the browser; in Configure you can pick the final alarm, your own file or a YouTube video. Shortcuts: Space start/pause, R reset, F full screen.

Frequently asked questions