Sometimes they could have something wrong with their brain which causes them to act in ways they can not control
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D, because if you don't smoke but you eat junk you would still be unbalanced and if you don't work out your going to be large so its all of the above
I believe that it relates to or involves free oxygen, if it is used in exercise- aerobic practices help improve the the efficiency of the body's cardiovascular system with absorbing and transporting oxygen.
Hope this helps