Answer:
Improves the muscles' ability to pull oxygen out of the blood.
Step-by-step explanation:
Works on the muscles' capacity to haul oxygen out of the blood, diminishing the requirement for the heart to siphon more blood to the muscles. Lessens pressure chemicals that can put an additional a weight on the heart. Works like a beta blocker to slow the pulse and lower circulatory strain.
7th Grader Way:
It improves the muscles with the intersesting ability to pull oxegyn out of blood.
Hope this helps! :D And I hope that is a good "7th Grader Way."