If they want to gain loose weight then they would need to eat well, so taking in a normal amount of calories but exercising more. To gain wait, take in more healthy calories but not that much of an extreme work out.. Hope this helps.
Marathons,soccer,volleyball,football,kickball,tennis,badminton etc...
idk if that is the answer you wanted
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i think is 12 to 19 sorry if im not right
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generation list the term use international to refer to education programs