Interval Timer (com.magnuswikhog.intervaltimer) on Google Play
Interval Timer lets you set alarms at different intervals and with different sound effects, making it ideal for workouts. Each interval can have its own notification sound - either one of the predefined sound effects or any audio file you want. The app lets you create multiple profiles to easily organize intervals according to your everyday needs. Each profile also has a setting for how many times it should be repeated. For example, you might want to have one profile for yoga, another for the gym, and yet another for running intervals. The app lets you accomplish this easily.