Tabata vs HIIT: what's the difference?

The class timetable says "Tabata" on Monday and "HIIT" on Wednesday, and they look like the same thing. They nearly are. HIIT (high-intensity interval training) is the whole family of short, hard efforts with rest. Tabata is one strict member of it: 20 seconds all-out, 10 seconds rest, 8 rounds, 4 minutes.

In short

All Tabatas are HIIT. Not all HIIT is Tabata.

A true Tabata is 8 × 20 seconds at a brutal effort with only 10 seconds' rest. Most HIIT uses longer work, longer rest, or both.

For most people, longer HIIT formats such as 30/30 or 40/20 are easier to pace and to do well. A Tabata works best as a short, hard finisher.

1. What is HIIT?

HIIT is any session that alternates short, hard efforts with recovery.

The UK Chief Medical Officers' guidelines describe HIIT as very vigorous activity done in short bursts with breaks in between. There's no single format. Common ones include:

Format	Work	Rest	Typical rounds
30/30	30 s	30 s	8 to 12
40/20	40 s	20 s	8 to 10
1 minute on, 1 off	60 s	60 s	6 to 10
4 × 4	4 min	3 min	4
Tabata	20 s	10 s	8

You can do HIIT on a bike, a rower, a treadmill, outdoors, or with bodyweight exercises.

2. What is a Tabata?

A Tabata is a fixed HIIT format: 20 seconds of work, 10 seconds of rest, 8 rounds. Four minutes in total.

It comes from a 1996 study by Professor Izumi Tabata and colleagues in Japan. People trained on an exercise bike in the lab at about 170% of their VO2max, which is far harder than a flat-out effort feels to most of us. After six weeks, their anaerobic capacity rose by 28%, and their aerobic fitness rose too.

Most gym "Tabatas" use the timing but not that intensity. Trainer Jonathan Ross, writing for the American Council on Exercise, suggests calling these "Tabata-inspired". That's fine. Just know what you're doing.

More in what a Tabata workout is and how to time it.

3. What's the main difference?

The work-to-rest ratio, and how strict the format is.

	Tabata	Other HIIT
Work	20 seconds	Usually 20 seconds to 4 minutes
Rest	10 seconds	Often equal to or longer than work
Work-to-rest	2 to 1	Often 1 to 1 or 1 to 2
Total hard work	4 minutes	Often 8 to 20 minutes
Feel	Very short, very hard, falls apart late	Hard but more even across rounds

Because the rest in a Tabata is so short, you don't recover between rounds. Your output usually drops sharply by round six or seven. In longer-rest HIIT, you can hold a similar effort for every round.

4. Which is better for fitness?

Neither, on its own. They do slightly different jobs.

A Tabata suits:

a short, hard finisher at the end of a session
days when you only have 15 minutes, including warm-up
people who are already fit and want a very hard effort

Longer HIIT formats suit:

most people starting interval training
holding a steady pace on each round, such as on a rower or treadmill
classes with mixed abilities
building up the total time you spend working hard

The NHS recommends at least 75 minutes of vigorous activity a week, or 150 minutes of moderate activity, plus strength work on two days. The UK Chief Medical Officers say short spells of very vigorous activity count too. Both formats can be part of that.

5. How hard should each feel?

Use the NHS talk test. At vigorous intensity, you can't say more than a few words without pausing for breath.

Tabata: at least that hard from round one, and very hard by the end.
Other HIIT: vigorous in the work spells, back to moderate in the rest.

A useful check, from us: in a 30/30 session, your last round should be close to your first. If it's much worse, start slower. In a Tabata, a big drop-off is part of the format.

6. Which exercises work best?

For both, pick movements that are safe when you're tired and easy to start and stop:

exercise bike or air bike
rowing machine
running, on a treadmill or outdoors
bodyweight squats, step-ups, mountain climbers

Avoid heavy or technical lifts in either. A tired, rushed deadlift isn't worth it.

For a gentle start on a treadmill, see treadmill interval workouts for beginners.

7. How often should I do HIIT or Tabata?

Two or three hard sessions a week is plenty for most people, on non-consecutive days. Fill the other days with easier activity and strength training.

If you have a heart condition, are pregnant, are recovering from an injury or illness, or haven't exercised for a long time, speak to your GP before starting very hard intervals.

8. How do I time them?

Set the three numbers before you start: work, rest and rounds.

Tabata: 20 seconds work, 10 seconds rest, 8 rounds.
30/30: 30 seconds work, 30 seconds rest, 8 to 12 rounds.
40/20: 40 seconds work, 20 seconds rest, 8 to 10 rounds.

Add a 5 to 10 minute warm-up first. Our interval timer basics guide explains how to choose and progress the numbers.

How Reptyl helps

Reptyl Timer runs both.

A ready-made Tabata, alongside EMOM, plank sets and treadmill sessions such as 30/30, a pyramid and 4 × 4.
Your own timers. Set work, rest, rounds and labels for 40/20 or any HIIT format, and keep them for next time.
Colour and a buzz. Every change fills the screen with colour and buzzes the phone, so you know when to switch with the music up.
Carries on if the app closes. Lock the phone and it still buzzes at each change.

It's a one-off purchase with no subscription, no account and no adverts, and your data stays on your phone. The Timer page has the details.

Quick answers

Is Tabata harder than HIIT?

A true Tabata is one of the hardest HIIT formats, because the rest is so short. But many HIIT sessions last longer, so the total session can feel just as tough.

Is 4 minutes of Tabata enough?

It's a short session on its own. It works well as a finisher, or as two to four Tabatas with a couple of minutes' rest between them.

Can beginners do Tabata?

Yes, with a gentler version: 20 seconds work and 20 seconds rest, or 4 rounds instead of 8. Build up from there.

Is HIIT better than steady cardio?

Not better, different. HIIT fits more hard work into less time. Steady cardio is easier to recover from. Most people do well with some of each.

Want a Tabata or HIIT timer you can see and feel? See Reptyl Timer