Tabata Timer Interval Timer is a free interval workout timer app for high intensity interval training (HIIT).
It is more than a stopwatch or countdown clock.

Are you looking for a good interval timer app in material design?
If so, you're in the right place! 😉

This Tabata Timer Interval Timer offers:
🕐 Good and modern looking Material design theme following Google's guidelines.
🕑 Very intuitive interface. After installing this interval timer you need to press one button to start a tabata workout with classic settings.
🕒 Ability to set up prepare, work, rest, rest between sets, cool down time, cycles and sets count.
🕓 Intervals can be configured individually, with this interval timer you can create any workout with any sequence of intervals.
🕔 Huge digits!
🕕 Works in background and shows the current progress in a notification when your screen is locked or you are using another app (music player, workouts app, etc).
🕖 Sound and vibration. Over 30 sounds available! You can set up sounds for each interval type, for last seconds, time left for work interval, halfway, every second.
🕗 Voice assistant.
🕘 Music.
🕙 You can add a description to each interval which will be shown on the timer screen.
🕚 Any interval can be started in repetitions mode. In it, the next interval will be started only by clicking on the next button.
🕛 Ability to enter and display time in seconds or minutes.
🕐 List of your saved workouts, sequences of workouts.
🕑 Previous and next buttons, list of intervals to jump back and forward within your workout.
🕒 Customizable colored states.
🕓 Ability to change device’s orientation or to lock it.
🕔 Ability to lower music volume in your music player while playing the timer sounds. Just turn it on in the settings.
🕕 Integration with Google Fit.

Use this circuit timer for training in the gym with weights, kettlebells, bodyweight exercises, crossfit, TRX, spinning, calisthenics, jumping jacks, tabata, boot camp circuit workout training, or any other high intensity intervals training.

This intervals timer will be useful for sprints, push-ups, sit-ups, cycling, running, weightlifting, martial arts, and other fitness activities.

Whether it’s for your HIIT workouts, circuit training in the gym or at-home bodyweight training workouts, this exercise timer is for you.

Numerous studies have shown that HIIT workouts burn more fat than regular training because they speed up metabolism within 24 hours after exercise. Production of growth hormone that affects the intensity of fat burning, increased up to 450%. HIIT accelerates metabolism, increases aerobic endurance, increases the level of tissue oxygen consumption. Tabata training has a positive effect on glucose metabolism gradually reducing adipose tissue sensitivity to insulin.

Some information from wiki:
High-intensity interval training (HIIT), also called high-intensity intermittent exercise (HIIE) or sprint interval training (SIT), is a form of interval training, an exercise strategy alternating short periods of intense anaerobic exercise with less-intense recovery periods. HIIT is a form of cardiovascular exercise. Usual HIIT sessions may vary from 4–30 minutes. These short, intense workouts provide improved athletic capacity and condition as well as improved glucose metabolism.

You can use this circuit training timer for such regimens: Peter Coe, Tabata, Gibala, Zuniga, Timmons, and many other.