Probably a question that is easy to answer but ...
I'm planning on starting interval training and wondering how people keep track of their intervals ... which interval they are on, how much time left, how much time on the recovery/rest portion, etc. I have a Polar S710 which allows for interval training but is limited in that it does not permit intervals for fidderent lengths (i.e. some 60s intervals and some 90s intervals). I wish to do these types of intervals but imagine that if I did, I'd get lost in where I was in the training session. Any advice is appreciated.
