Cornerman

A round timer for boxing training. Set the round and rest lengths, start it, and it calls combinations at you while you work, so a solo session on the bag has some structure instead of drifting.

Built phone-first because the phone is what is actually in the gym: controls big enough to hit with a glove on, a screen that stays awake through a round, and everything cached so it keeps running when the gym's signal does not.