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Density of mitochondria taken from the tissue of a marathon runner

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I do not quite understand what or how the density of mitochondria would be any different in tissue taken from the legs of a marathon runner or the biceps of a weight lifter vs. a couch potato.

Can you explain this concept?

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The expert determines the density of mitochondria taken from a tissue of a marathon runner versus a couch potato.

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To do work, the muscle cell has to produce energy to be used in the contraction of the muscle cell, thereby doing the work. This energy production - mainly by "burning" sugar, fat or protein is done in the mitochondriae (Latin plural of mitochondria). These are cell organells and the "power stations" of the cell. They consume ...

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