Boxing iTimer is very popular on the AppStore!
Use it for boxing training, MMA, HIIT, Tabata, Yoga, Sparring or any other sport requiring rounds.
Main features: simplicity, just enough configurations, works from background and with locked phone, can listen to iPod music at the same time.
Features in details:
1) Number of rounds is from 1 to 15
2) Round Length betwee 30 seconds and 20 minutes
3) Break Length between 20 seconds and 5 minutes
4) Customizable notice sticks before each round ending
5) Screen never goes dimmed by itself. You can always see the status. Or you can go to any other app or lock your phone
6) Works in background and in locked device.
7) You can listen to iPod music and run Boxing iTimer at the same time
8) Session Progress Chart shows the number of rounds, current and remaining time
9) Red color for breaks, Green color for Rounds, Orange color for Round Endings