__37__ Aerobic exercise gets out heart rate going faster and increases our breathing. Activities like walking at an increased speed, dancing, swimming or riding a bicycle are good examples. Musclestrengthening activities help build and strengthen muscle groups in the body. __38__
Experts say adults should get at least two and a half hours of aerobic exercise each week. More intense activities reduce the suggested amount of time to one hour and fifteen minutes. __39__
Earlier advice from the Centers for Disease Control said people need to exercise thirty minutes each day for at least five days to get the health benefits of exercise. More recent research suggested that those gains are the same whether you exercise for short periods over five days or longer sessions over two or three days. __40__ They help people guarantee that they stay with the program.
A.There are two separate, but equally important kinds of physical activity.
B.This kind of exercise includes lifting weights, or doing situps and pushups.
C.Health experts have long noted the importance of physical activity.
D.There is some debate about exactly what causes the brain to release endorphins.
E.Experts say people should choose physical activities that they find fun.
F.Some examples are playing basketball, swimming and distance running.
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