High Resistance Intervals (HRI)

HRI improves the aerobic abilities of your fast twitch muscle fibers which are your fast an explosive fibers, but they fatigue very quickly.

This method can help extend the time to fatigue of these muscle fibers by supplying them with a constant supply of oxygen.

You must use a training mode of training that provides resistance for with HRI.

To perform HRI follow these recommendations;

- 10 - 20secs per set

 - 15 - 20 sets per session

- rest until heart reate returns to 130bpm

- exercises to use include hill sprints, ropes, heavy bag boxing or cardio machines where you can turn up the resistance

This method is taken from Joel Jamieson at www.8weeksout.com.