How to use the online timer
Twenty seconds of maximal effort and ten seconds of rest, eight times through, comes to exactly four minutes. The protocol takes its name from Izumi Tabata, whose 1996 study on Japanese speed skaters compared it with an hour of moderate cycling, and the intervals in that study were performed at around 170 per cent of aerobic capacity: not brisk, not hard, but genuinely all-out on a stationary bike under laboratory supervision.
That detail matters, because most of what gets called Tabata is not. The ten-second rest is barely enough to reset your stance, and the design only works if the effort from the first round is close to everything you have. Pacing yourself through a Tabata is a contradiction, since there is no later to save anything for. The honest test is whether the reps in round eight have dropped noticeably from round one; if they have not, it was not maximal.
Because of that intensity, one four-minute block is usually plenty, rather than something to repeat three times back to back. Simple, low-skill movements suit it well, since technique falls apart quickly at this effort. A full warm-up beforehand matters more here than in any other format, and the few minutes of easy movement afterwards are not optional either.
Common questions
Where does the twenty-ten format come from?
From Izumi Tabata's 1996 study on Japanese speed skaters, where the intervals were performed at around 170 per cent of aerobic capacity on a stationary bike. The intensity was the point, not the timing.
Do I need to hold something back for the later rounds?
No, and that is what makes it different from other formats. There is no later to save anything for in four minutes, so if the reps in round eight have not dropped noticeably, it was not maximal.
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