High-intensity exercise, primarily concentric, can increase mitochondrial numbers in cells, whereas chronic exhaustive exercise may not increase, and can sometimes decrease, mitochondrial numbers.

“when you're doing these high intensity exercises I think the main benefit is that because most of them are concentric uh you're actually increasing the number of mitochondria in your inner cells well with the chronic long distance kind of like exhaustive exercise you actually not increasing uh the number of mitochondria sometimes may decrease it but most of the infection is here neutral”