| A | B |
|---|
| aerobic | referring to the presence of oxygen |
| aerobics | a type of exercise which strenghthens the lungs and heart; continuous activity without rest |
| bone marrow | makes new red blood cells |
| coccyx | the tailbone |
| deltoid | a large, triangular-shaped muscle of the shoulder; helps in raising the arm |
| flexibility | ability to bend easily |
| muscles | make your body move |
| obesity | the state of being 20% or more overweight |
| ribs | a cage that protects your internal organs |
| sartorius | the longest muscle in the body |
| skull | the bones of the head; protects the brain |
| subcutaneous | beneath the skin |
| subcutaneous layer | the fatty layer of the skin that stores energy |
| warm-ups | a light exercise that increases blood circulation to the muscles |
