You are following a High-intensity interval training (HIIT) or simply a routine in which you alternate periods of exercise with recovery periods: run vigorously for 30 seconds then walk for 1 minutes, etc. But you don't use gym, how can you keep up the time?
WorkoutWatch is here to help. Not just a normal stopwatch, with WorkoutWatch you can set the duration for each exercise interval and duration for each rest interval and start measuring. The app also keeps track of number of exercise intervals and rest intervals you have done so far.