HIIT Interval Timer
Run interval timers for HIIT workouts, with work and rest periods.
Keeping time so you don't have to
High-intensity interval training alternates hard work periods with rest, and trying to watch a clock mid-effort ruins the workout. This runs the intervals for you — signalling when to push and when to recover — so you can focus entirely on the exercise.
Set your work and rest periods and start the timer.
Why intervals work, and training sensibly
Interval training is time-efficient and effective because the alternation of hard effort and recovery lets you accumulate more high-intensity work than continuous all-out effort would allow, driving fitness gains in relatively short sessions. The structure — fixed work and rest periods, often repeated in rounds — is exactly what a timer handles well. Because it is genuinely intense, it is worth respecting: warm up properly, keep good form as fatigue builds, and build up gradually rather than starting at maximum. This is general fitness information; if you are new to exercise, older, or have any health condition, it is wise to consult a doctor before starting high-intensity training.
Frequently asked questions
Why is a timer important for HIIT?
Because watching a clock mid-effort ruins the workout — a timer signals when to push and recover so you can focus entirely on the exercise.
Why is interval training effective?
Alternating hard work with recovery lets you accumulate more high-intensity work than continuous effort, driving fitness gains in short sessions.
Is this medical advice?
No — it is general fitness information. If you are new to exercise, older, or have a health condition, consult a doctor before high-intensity training.