Skeletal Muscles, Cardiac Muscles, and Smooth Muscles
Because it decreases the amount of calories and nutrients the body is able to absorb.
Teens are most likely to understand instructions.
With toddlers and babies, it's pretty difficult for them to cooperate since they can easily forget what they are doing. With teens, it's much easier for them to cooperate since they are older and more mature which means that they could be willing to listen.
About sixty minutes per day