Workout Timer is a form of high-intensity interval training (HIIT):

Preparation time 10 seconds.
Workout hard for 60 seconds.
Rest for 30 seconds.
Complete 6 cycles.

Only 5 minutes workout that replaces 1 hour of fitness.

YOU CAN USE THIS TIMER AT HOME, AT THE GYM, OR FOR INTERVAL WORK ON THE TRACK AS WELL.