Tabata timer
Twenty seconds flat out, ten seconds to breathe, eight times. Four minutes that feel much longer.
Total 4:00 · work 2:40 (67%) · 16 segments. Three short beeps count you into every change; a finish chime marks the end.
Alarm & notification settings
Sound needs one tap on the page first (a browser rule). Keep this tab open: closing it stops every timer’s alarm. Why timers stay accurate in background tabs.
Where the four minutes go
Slide the rounds to see how quickly the rests add up. Each bar is one 30-second round.
8 × 20 s work = 160 s · 8 × 10 s rest = 80 s · total 4:00
The work-to-rest ratio stays 2:1 however many rounds you do. That means you never fully recover between rounds, which is the point of the protocol.
Where 20/10 comes from
In 1996, Izumi Tabata and colleagues at Japan’s National Institute of Fitness and Sports published a study in Medicine & Science in Sports & Exercise comparing moderate steady cycling with short, very intense intervals: 20 seconds at roughly 170% of VO₂max, 10 seconds of rest, repeated until exhaustion (about seven or eight bouts). Over six weeks, the interval group improved both aerobic and anaerobic capacity.
Two details get lost in most “Tabata” classes. The intensity in the study was far beyond a normal hard effort, and the subjects were trained athletes on bikes. A bodyweight circuit at a comfortable pace in the same 20/10 rhythm is still a useful workout; it just isn’t what the paper tested.
Questions
What is a Tabata workout?
Eight rounds of 20 seconds of all-out work and 10 seconds of rest, four minutes in total. It is named after Izumi Tabata, whose 1996 study in Medicine & Science in Sports & Exercise tested this protocol on a cycle ergometer.
Is a 4-minute Tabata enough of a workout?
The original protocol was a single four-minute block done at a very high intensity after a warm-up. Most gym classes repeat several Tabata blocks with a minute or so between them; set Sets above 1 to do that.
Which exercises work for Tabata?
Ones you can do hard and safely when tired: bike or rower sprints, jump squats, burpees, kettlebell swings, mountain climbers. Avoid technical lifts where form breaks down under fatigue.
Can I change the 20/10 timing?
Yes, every number is editable. Strictly speaking it is no longer a Tabata then, but 30/15 or 20/20 versions are common for beginners.