Leo hikes to stay fit. He wants to increase his cardiorespiratory endurance so that he can complete a big hike this summer. Over time, Leo gradually increases the length of his hikes rather than trying to do too much too soon. The Training Principle referred to here is linked to overload and is called

It's called a physical resistance exercise.

Explanation:

This type of exercise is responsible for stimulating and strengthening the white muscle fibers, or also called slow, which are more frequent in women, on the other hand the contraction of these fibers leads to long, high-consumption and little cardiac explosion, therefore a lot of physical resistance.

the answer would be  

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