This is very handy for boxing drills. I use this app multiple times a week. Simple and easy. One suggestion I have is including a round limit. There have been times that I train a certain number of rounds at night and put my phone on silent without remembering to shut it off. It will just keep running until the battery is out. Despite this, it is simple and deserves 4 stars.
RegularDood about Boxing Timer, v2.2.1