It's like they had HIIT in mind when they created the app :} – Interval Timer - Tabata Timer Review

Great app and you get out of it what you put in. The ability to play your Apple Music playlists is awesome and the amount of ways you can tweak this is great... it keeps you energized and motivated with the different transitions... or I could just have an awesome playlist, kidding! It's a great app!
Review by iJREL on Interval Timer - Tabata Timer.