Fantastic!

I was looking for an easy way to get in a HIIT workout 3x a week, and this is PERFECT! Super easy to use, easy to customize, and the starter workouts are great and help you learn how you want to customize. I use it on my spin bike and with my TRX. Works especially well with my ipad - huge letters and colors are easy to see. Love that you can change the colors and put your own music in. Would recommend this app in a heartbeat. Ha ha.

mjmeyerson about Seconds Pro Interval Timer, v3.1