A simple, free, reliable tabata or HIIT timer. It runs in the background and sounds an alarm even when the screen is off.
As the app runs in the background any interruption to your training is handled gracefully and the reset button allows you to start over. However, there is no pause button because you shouldn't be "pausing" a interval training session.
Tabata or other HIIT with any exercise is an effective (yet ideally very tiring) way of keeping fit and strong.
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which features you'd like next.
-runs in background
-changes screen colour during work / rest periods
-looks great on new phones.