What is the Infinite Interval Timer?
It is a very simple but massively versatile way of timing virtually any interval training session. It is a series of mp3 files of 10 seconds, 20 seconds, 30 seconds, 1 minute, 2 minutes, 3 minutes and 5 minutes in length. These are to time how long your work/rest intervals can be. You can tell when they start/stop by a 5 second countdown followed by a ringing bell (like you hear in boxing).
To make the Infinite Interval Timer work, just download it, unzip the files (they are compressed for easy downloading), load it onto your mp3 player and listen to when the bell rings!