HIIT timer

High-intensity interval training is short hard efforts with short rests, repeated. This timer reads the intervals you write: 8 x 30s on 15s off is eight rounds of thirty seconds of work and fifteen of rest; 45/15, 40 on 20 off x 10 and 10 x 1 min on 30s off all work too.

Bracket the intervals with a warm-up and a cool-down as above, name the movements — 8 x (30s squats, 15s rest) — or chain two blocks: 8 x 30/15, 2 min rest, 8 x 20/10. The preview shows every block and the total time before you start; the last rest is kept unless you say between.