Twenty seconds of work. Ten seconds of rest. Eight rounds. Four minutes.
That is the whole thing. If you came here to type numbers into a timer and get on with it, you now have everything you need. The rest of this page is about the variations, where the numbers came from, and the two or three details that decide whether the workout feels like training or like fumbling with a phone.
The settings you type in
Almost every interval timer asks for the same four fields. Here is what goes in each one for a standard Tabata:
- Work / high interval: 20 seconds
- Rest / low interval: 10 seconds
- Rounds / cycles: 8
- Sets: 1
- Prepare / countdown: 10 seconds
Set the prepare countdown even if you think you do not need it. Without it, the timer starts the instant you tap go, and you spend the first work interval putting the phone down.
One detail trips people up: 8 rounds of 20 and 10 comes to 240 seconds, and that total includes the last 10 second rest. The four minute figure is the clock, not the working time. You are actually working for 160 seconds of it.
Tabata intervals and the variations people actually run
The 20/10 pattern is the original. The others below are interval training that borrowed the format, and they are all worth running, as long as you call them what they are.
| Protocol | Work | Rest | Rounds | Total time |
|---|---|---|---|---|
| Tabata (canonical) | 20s | 10s | 8 | 4:00 |
| Tabata, 2 sets (60s between sets) | 20s | 10s | 8 x 2 | 9:00 |
| 30/15 | 30s | 15s | 8 | 6:00 |
| 40/20 | 40s | 20s | 8 | 8:00 |
| 45/15 | 45s | 15s | 8 | 8:00 |
The 2 set version is the most common way people extend a 4 minute Tabata without breaking it. Run all 8 rounds, take a full minute standing up and breathing, then run 8 more. Nine minutes on the clock, and the second set will tell you honestly whether you paced the first one.
The longer work intervals change the workout underneath. At 20 seconds you can hold something close to a sprint. At 45 seconds you cannot, so 45/15 becomes a threshold effort with a different feel and a different purpose. Neither is better. They are different jobs.
Where 20 and 10 came from
The numbers trace back to a 1996 paper by Izumi Tabata and colleagues at the National Institute of Fitness and Sports in Kanoya, Japan, published in Medicine & Science in Sports & Exercise. The pattern itself came out of coaching practice with the Japanese national speed skating team before it reached the lab. The study subjects were physically active young men at the institute, not the skaters themselves, which is the part most articles get wrong.
The protocol they tested was seven to eight bouts of 20 seconds on a mechanically braked cycle ergometer at roughly 170% of VO2max, with 10 seconds of rest between bouts, performed to exhaustion. That last word is doing a lot of work. Tabata has since described the protocol as training at an intensity that exhausts the subject during the seventh or eighth bout. If you can finish round eight comfortably, the intensity was too low to be the thing that was studied.
Over six weeks, the high intensity group trained four days a week on that protocol with a fifth day of steady cycling, while a comparison group did 60 minutes at moderate intensity five days a week. The high intensity group improved both anaerobic capacity, by around 28%, and VO2max. The moderate group improved VO2max but showed no change in anaerobic capacity.
What the study showed is that a very short, very hard intermittent protocol moved both energy systems in trained-ish young men on a bike. What it did not show is that four minutes replaces all other training, or that any 20/10 circuit produces the same result. The intensity was the finding. The clock was just the container.
The mistake nearly everyone makes
The 10 second rest is not a break. It is part of the interval, and it exists to let you go hard again immediately, not to let you recover.
Watch a class run Tabata and you will see what goes wrong. People finish the work bout, stand up, put their hands on their head, take a walk, and drift back into position as the next bell rings. Ten seconds is barely enough time to set your feet. If you spend it walking, you arrive at the next round late and slightly less ready, and the whole point of the compressed rest disappears.
Two practical rules. Stay in position during the rest, hands on the bar or feet on the pedals, breathing. And pick a load you can hold for eight rounds while emptying yourself, not a load you can hold forever.
The second failure is more common than the first: going too easy for it to be Tabata at all. Bodyweight squats at a conversational pace for 20 seconds is a warm-up in Tabata clothing. If round three feels sustainable, you are doing a circuit. Real Tabata intensity means rounds seven and eight are ugly, your output has dropped, and finishing is in doubt. Air bikes, assault bikes, rowers and hill sprints get you there easily. Most bodyweight moves need you to choose the hardest version you can survive rather than the one you can do neatly.
Cap it. One or two sets, twice a week, is plenty. The protocol is short because it is expensive, and treating it as filler is how people end up flat for a fortnight.
Audio cues, and never looking at your phone
A Tabata timer earns its place by letting you forget the phone exists. Once you are mid effort, glancing at a screen costs you a rep, breaks position, and, on a bike or a rower, is awkward.
What that requires:
- Distinct sounds for work and rest. Different pitch, not just different counts. You should know which state you are in from the sound alone.
- A last three seconds countdown before every work bout. This is the cue that gets you back into position on time and kills the walk-about problem above.
- A round number spoken aloud, or a clearly different sound on the final round. Knowing that this is the last one changes how much you leave on the table.
- Volume that survives a gym. Test it once with the phone in your pocket before you rely on it.
- It keeps running with the screen locked and while you are in another app.
For a tabata timer with music, the cue should duck the track rather than pause it. Audio that stops your playlist every 20 seconds turns four minutes into a fight with your phone. If your current app pauses instead of ducking, switch the cue to a short high beep and turn it up, which is usually loud enough to cut through a track at gym volume.
If you want something built around this specifically, Rounds is an iPhone interval timer I have been building around the 20/10 pattern. It is in open beta through TestFlight at the moment.
A 4 minute Tabata you can run today
Pick one movement you can go hard at with no technical risk when tired. Air bike, rower, hill sprint, kettlebell swing at a moderate weight, or squat jumps.
Set 20 seconds work, 10 seconds rest, 8 rounds, 10 second prepare. Start the timer, put the phone down screen-first, and do not touch it again until the finish sound.
Count your reps or watts on round one and again on round eight. If the two numbers are close, add load or speed next time. If round eight collapsed to half of round one, you started too hot, which is the more useful mistake because it means you found the ceiling. Either way you now have a number to train against, which is worth more than the four minutes on its own.
Rounds keeps that history for you, so the comparison is there without a notebook. Whatever timer you use, the numbers in the table above are the same ones, and they are the part that matters.
Common questions
How do you set a Tabata timer?
Set the work interval to 20 seconds, the rest interval to 10 seconds, and the number of rounds to 8. That gives you 4 minutes of total time, including the final 10 second rest. Add a 5 or 10 second countdown before the first round so you are moving when the first bell goes.
How long is a Tabata round?
One round is 30 seconds: 20 seconds of work followed by 10 seconds of rest. Eight of those rounds make one Tabata set, which runs exactly 4 minutes. Some apps call a round 'one interval' and others count work and rest as separate steps, so check whether 8 means 8 work bouts or 8 total intervals.
Is a Tabata timer free?
Plenty of them are. A timer only has to count down two numbers and play a sound, so the basic job is given away by dozens of apps, and your phone's built-in clock can do a rough version if you are willing to watch the screen. Paid tiers usually cover saved routines, history, music handling and watch support rather than the timing itself.
What is the best free Tabata timer app?
The one you can run with the phone face down in your bag. Judge a Tabata timer app on three things: whether the audio cues are distinct enough to tell work from rest without looking, whether it keeps running when the screen locks or you switch apps, and whether it ducks your music instead of stopping it. Anything that fails those three will annoy you by the third round.
Can you run a Tabata timer with music?
Yes, and the interval cues should sit on top of whatever is already playing. A good tabata timer with music support lowers the track volume for a moment, plays the cue, then brings the track back, rather than pausing playback. If your app stops your music every 20 seconds, turn its cues up and use a short beep instead of a spoken countdown.
Is 4 minutes of Tabata really enough?
Four minutes at true Tabata intensity is enough to leave you unable to continue, which was the point of the original protocol. It is not enough on its own to cover strength, mobility or steady aerobic work. Most people use one or two Tabata sets as the hard piece inside a longer session rather than as the whole session.