A.They insist that arm exercises fit everyone.
B.They regard arm exercises as best sport.
C.They don't hold the same idea on the best exercise.
D.They should do some exercises because they are fat and flabby.
A.They don't get rid of flabby arms.
B.They can damage arm muscles.
C.They aren't acceptable to most people.
D.They can raise one's blood pressure.