Slowly extending stretches until the muscle hurts
Gradually increasing the challenge level of stretches
Quickly swinging the arms back and forth for more stretch
<span>Intensely holding stretches for five to 10 seconds</span>
I think it would either be A or D! Hope this helps.
Also called aerobic<span> exercises. Any of various sustained exercises, like jogging, rowing, swimming, or cycling that stimulate and strengthen the heart and lungs thereby improving the body's utilization of oxygen.</span>
