I've been doing HIIT (30 sec sprint, 1 min walk) for a couple of weeks now and I've been managing about 10 minutes before my sprint speed is significantly reduced. Should I aim to get myself into a real "out of breath" state where it gets very difficult to sprint properly, or should the intensity be kept lower than this?
Surely the higher the intensity the better the workout? (unless you make yourself ill).
Surely the higher the intensity the better the workout? (unless you make yourself ill).