What is ideal length of time for a cool down following intense workout

Min is a 1Min, and the Max should not be more then 3min. you don't want your body to start tightening up and cooling down to much. Makes starting back up just that much harder.. that's why its good to have a partner. then you go into 30 sec cool down periods+ your partners rep time.

The answer would be d. most contraceptives are effective when used properly