I've been using this lately for interval running.

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I’ve been using this lately for interval running. You can set sets so I’ve been mixing between 1 min walk and 1 min running.

play.google.com

Interval Timer – Apps on Google Play

Interval Timer is simple and easy to use. Full screen color coding makes the minimalistic interface glanceable from afar. Suitable for all kinds of activities, including: - Boxing round timer - Calisthenics circuit timer - Circuit training - HIIT training - Tabata Features people love about Interval Timer: - Save your presets to quickly switch between different activities. - Use it in the background while using other apps or with your screen locked. - Get additional audio, vibration or silent n...

Free