Coach Timer will help you to start and maintain your workout routine. Use different timers for your workouts or create new custom timers for your specific workout. The activity tracker will help you to keep your routine and keep you working out. HIIT workouts are a high intensity interval training method which will leave you exhausted after only 4 minutes. Try it with a variety of different exercises: boxing, Tabata, sprints, kettlebells, push-ups, sit-ups, skipping, etc. Now we also have breathing exercises like 4-7-8 technique. Do you have any suggestion to improve the app? Please, contact me on the contact menu.