Is four minutes really a whole workout?

At the effort the protocol was designed around, four minutes is enough to be the hardest part of a training day. It is not a whole session on its own, and treating it as one is how people end up doing very little.

What should I pick for the exercise?

One simple movement you can repeat while exhausted. Squats, swings, mountain climbers or a bike. Changing exercise between intervals defeats the format.

Why does the clock stop after the eighth work interval?

The final ten seconds of rest are followed by nothing, so there is nothing to count down. All eight work intervals are there.

Timer · preset of tabata timer

4 minute Tabata timer

The original protocol. Eight intervals of twenty seconds on and ten off, on one exercise, and nothing else.

Open the full tabata timer to change anything this preset fixes

The timer

Lead-in

Intervals: 8

Stations, one per line

Named stations appear on the clock as they come up. Leave it as it is to run one unnamed block.

The clock runs fullscreen and keeps the screen awake. It needs JavaScript, so with scripting off the plan below is the whole session written out.

Total: 4:00
Working: 2:40
Periods: 16

01ReadyGet ready0:10
02WorkWork0:20
03RestRest0:10
04WorkWork0:20
05RestRest0:10
06WorkWork0:20
07RestRest0:10
08WorkWork0:20
09RestRest0:10
10WorkWork0:20
11RestRest0:10
12WorkWork0:20
13RestRest0:10
14WorkWork0:20
15RestRest0:10
16WorkWork0:20

How it works

Four minutes is the protocol as it was published: eight intervals, twenty seconds of work, ten seconds of rest, one exercise throughout. Everything else called Tabata is an adaptation.

The single exercise matters more than people expect. Repeating one movement is what drives the fatigue curve the protocol depends on, and rotating movements spreads the load out and turns it into a short circuit.

Rounds five to eight are the session. The first four are the entry fee, and the honest test is whether round eight looks anything like round two. Most first attempts fall apart around round six because the opening pace was a sprint.

Put it at the end of a training day rather than the start. Done properly it leaves very little behind, and a heavy lift attempted afterward will be worse than it should be.

Questions

Is four minutes really a whole workout?: At the effort the protocol was designed around, four minutes is enough to be the hardest part of a training day. It is not a whole session on its own, and treating it as one is how people end up doing very little.
What should I pick for the exercise?: One simple movement you can repeat while exhausted. Squats, swings, mountain climbers or a bike. Changing exercise between intervals defeats the format.
Why does the clock stop after the eighth work interval?: The final ten seconds of rest are followed by nothing, so there is nothing to count down. All eight work intervals are there.