Timer Sound is an easy to use special app for high intensity interval Training.

Whether you workout regularly, practice meditation or simply need a tool to track your working hours, Timer Sound is for you!
Set as many timers as desired, save the settings & use the customized timers again and again.

You can also create personalized interval workouts with warm-up, workout & rest periods and cool down!

https://itunes.apple.com/it/app/timer-sound/id1241352438?mt=8