Possibly the best and most easy to use interval timer app, that lets you configure your own custom workout.
• Fast setup
• Set exercise duration as you please
• Choose workout length
• Define how often you want a recovery break
• Audio instructions on your workout
• Enter your own exercises (if you want to), then get spoken audio cues what exercise comes next
• Easy to use, no complicating features
• Interval training
• Tabata
• 7 Minute workout
• Fitness
• Boxing
• HIIT high intensity interval training
• Yoga
• Crossfit
• Home workout