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The answer can be both increase in self-esteem and increase in aggression. All of the research generally points to increase of self esteem because during puberty self awareness is very prominant which increases self esteem. I would be safe and go with self esteem. I hope this helps.
Answer:
A.
They alternate running with pushups
Explanation:
if they run and do a little bit of pushups they will be ready for their hockey season