HIIT means High-intensity interval training. also called sprint interval training (SIT) or high-intensity intermittent exercise (HIIE) This is an enhanced form of interval training, an strategy alternating periods of short intense cardiovascular exercise with less-intense recovery periods.
This app is stopwatch for interval training. It is easy to use weightlifting, crossfit training, tabata, round timer, running, sports .. etc This app has a simple interface. And this app runs in background on your phone. So you can listen music with this timer app.