The nervous system in one's body sends signals to the muscles to contract in order to move or perform a task like walking. The respiratory system sends oxygen to the muscles in order to provide energy for those actions
The next time he goes surfing, he will get tired a lot faster and will run out of breath a lot faster. He will also feel a lot more tired quicker than he used to.
Depending on height but averagely 2,200
Hope this helps :)
It is important for teens to eat well because they are growing and need energy and they need to stay healthy.
