Aerobic exercise is:
a. stretching and movement of a specific muscle group
b. light weight-lifting
c. exercise that works out all of your muscle groups
d. exercise geared towards increasing your target heart rate

B) Light weight-lifting

Explanation:Aerobic exercise is any type of cardiovascular conditioning. It can include activities like brisk walking, swimming, running, or cycling. You probably know it as “cardio.” By definition, aerobic exercise means “with oxygen.”

Cardiovascular conditioning improves circulation and strengthens the heart, lungs and blood vessels. It builds endurance and strength for the heart muscle, whether a person is well or recovering from a disease or injury.