The concept of the "cardio triangle" relates to a structured approach to training cardiorespiratory fitness, specifically balancing different types of exercise intensity.

1. Base of the Triangle: The base represents "zone two" training, which is characterized by low-intensity, steady-state aerobic exercise. This type of training is essential for building aerobic efficiency and should constitute about 80% of your cardio exercise volume. As mentioned at 00:45:08, "the base is your zone two."

2. Peak of the Triangle: The peak represents VO2 max training, which is high-intensity exercise aimed at maximizing your aerobic output. This type of training should make up the remaining 20% of your cardio exercise volume. At 00:45:14, it is explained that "the peak is your VO2 max."

The 80/20 rule is applicable to both normal individuals and elite athletes, ensuring a balanced approach to improving overall cardiorespiratory fitness (00:45:20 - 00:45:29).

For a practical example of VO2 max training, you can perform activities like running up a hill and then taking it easy on the way down, as described at 00:50:37 - 00:50:54: "My favorite way to do VO2 max is on a hill that's about a mile long and just do very hard up the hill and then easy down the hill."

To summarize:
- Base (Zone Two Training): Low-intensity aerobic exercise (80% of volume) 00:45:08.
- Peak (VO2 Max Training): High-intensity aerobic exercise (20% of volume) 00:45:14.

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