Cardiac Power Intervals (CPI)

CPI improves the supply of oxygen at high intensities.

It also improves power endurance of the heart by increasing the strength of the heart's muscle fibres which also mitochondria which carries oxygen in the blood to the working muscles.\

To perform CPI follow these recommendations:

- 4 - 12 sets per session

- 60 - 120secs per set

- maximal speed for the entire set

- rest until heart rate returns to 130bpm

Any activity is fine for CPI just make sure that it gets you to at least 90% of your heart rate max (220 - your age).

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