Set the timer to 103 seconds

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How to use the online timer

A proper warm-up doesn't need to be long, and 103 seconds is enough to get your muscles moving and your heart rate up before you jump into the main session. Start the clock, run through a few dynamic stretches or some light cardio, and let the beep tell you when to switch rather than cutting it short because you're keen to get started. Rushing this bit just costs you later.

There's nothing to configure beyond tapping the button: press Start and the numbers begin ticking down straight away. The tab needs to stay open in your browser for the whole stretch, since closing it or switching the computer off stops the count, though you're free to switch to another tab and come back later. A clear alarm sounds the moment it hits zero, loud enough to notice from another room.

Setting an egg timer or fumbling with a phone app both work, but neither is as quick as a browser tab you already have open. There's no app store, no update prompt, and no login screen between you and starting the count. It's free and needs no registration, it works on any device with a browser, and closing other tabs won't affect it as long as this one stays open. People type this as set timer 103 seconds or timer for 103 seconds; both land here and start the same count.

Common questions

Does the timer work without an internet connection?

The page needs to load once, but the countdown itself runs locally in your browser, so a dropped connection partway through won't stop it.

Will the timer still run if my laptop goes to sleep?

No, if the device sleeps or the browser is suspended, the countdown pauses along with it, so keep your screen awake for an accurate result.

Is there a cost to use the timer?

No, it's free to use, with no registration, sign-up, or hidden limit on how many times you can run it.

Can I run more than one timer at once?

Yes, opening the page in separate tabs lets you track a few things at the same time, each counting down independently of the others.