She would be attempting to increase the ; ( A ) Uptake of oxygen by red blood cells
To increase endurance and reduce fatigue in the body, the amount of oxygen taken up by the red blood cells in the body will have to increase ( i.e. absorption of oxygen into the bloodstream will occur at a fast rate ).
The release of insulin is to control the glucose consumed into the body and not to increase the level of endurance a body should have especially when performing strenuous activities.
Hence we can conclude that She would be attempting to increase the uptake of oxygen by red blood cells.
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