In order to reap the benefits of exercise, a person must O be an exercise fanatic
do only modest amounts of exercise
O do certain ab exercises
be at the gym for hours a day

Do only modest amounts of exercise

Explanation:

Not everyone can spend all their time at the gym. Some exercise can go a long way.

well, it depends. it is natural to not fall asleep before 11: 00 p.m. teens need about 8-10 hours of sleep each night to function best.

enjoy your day!

because health skills are tools and strategies and also practical skills are also something you need to learn (like tools and strategies) and put it in reality.