Question

The ___________ is a strong wall of muscle that contracts to create a suction in the chest to draw in air and expand the lungs. When the muscle relaxes, the chest cavity decreases and the air is pushed out.

Answer 1

That is called the Diaphragm

Answer 2

______________training must target the muscle group that is needed for the activity you are training for. The best way to train your body to be able to do more push-ups is to do push-ups

Answer 3

It might be Muscular endurance training which is the ability of a muscle or group of muscles to sustain repeated contractions against a resistance for an extended period of time.