Self-tutoring about fitness and health: the tutor explores the idea of hiit (high intensity interval training).
High intensity interval training means alternation between maximum effort and light effort. Of course, the exerciser needs to warm up first. Then, the typical ratio of (maximum effort):(light effort) seems to lie between 1:1 and 1:2. For example, on the exercise bike, after appropriate warm-up time, the athlete might pedal one minute hard, then 1-2 minutes easy, then repeat the cycle, for around 30 minutes, followed by perhaps a five-minute light-effort cool down. Such might constitute a hiit session.
Source:Oracle Tutoring by Jack and Diane, Campbell River, BC.