Boxing Timer
Absolutely love this app! I workout to it all the time; it keeps me going! I set the rounds to include my rest time, so its hard for me to slack or take long breaks! And its loud enough too so I can pump up the jams and still hear the timer. I am always using this thing! I also have the real timer that looks just like the pic...but that thing is old cracked and really loud! Love that thing too, and used to always use it until I found this timer. Highly recommend!
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Boxing iTimer Lite