Update : I am removing a star because I am sick of the constant nagware request for a review.
Original review : I am a cheapskate, I rarely buy apps. This app has been worth every cent I paid. I use this app 6-7 times a week at work and at the gym. Every week or two I discover something new about the app. I never knew about the Timer Repository, but love using it once I discovered it. Have used the Tough Mudder and the 5K interval training timers innumerable times. Cant think of any improvements or changes that I would make.
min11a about Seconds Pro Interval Timer, v3.1