Tabata-style interval timer 20/10 x 4
20 sec work, 10 sec rest, 4 rounds. 2 min total.
What this one is for
Four rounds of 20 seconds work and 10 seconds rest produce a two-minute block. This is half the round count of the classic eight-round clock.
A shorter total does not make maximal effort a beginner prescription. Use the block to time a suitable planned activity. If you need more recovery, edit Rest; there is no requirement to progress automatically to eight rounds.
How it runs
20 sec work, 10 sec rest, 4 rounds. 2 min total. Press Start, or hit Space. The phase word and icon above the progress bar tell you where you are.
Check the Sound chip and device volume before starting. Work and rest have different tones. The tab title shows the time left. Start begins the first phase immediately; prepare your space first.
Keep the page visible for cues. The timer requests an awake screen, but the browser can refuse it or delay background sound. For offline use, load this exact page online and test a reload without a connection before relying on it.
Change the settings before starting. Work and Rest use seconds on this page. This page opens with its preset each visit; the main timer page remembers your valid settings.
Common questions
Is this the original Tabata protocol?
No. Classic Tabata timing is 20/10 for eight rounds. This is an editable interval variation; exercise and effort remain your choice.
What does the total include?
The default includes 4 work periods and 4 rests, including the last rest: 120 seconds altogether. Preparation and any longer gaps are separate.
Can I add a longer gap between blocks?
Run one block, take your planned gap separately, then choose Run again. Increasing Rounds repeats the same pair without adding longer gaps.