What is physical fitness?
a) the improvement of the body through intentional movement
b) the speed at which the body moves during exercise
c) the ability of the body to function efficiently during exercise
d) the performance of muscles for long periods of time

What is the main difference between trace elements and the main elements that make up the body? 1) main elements consist of heavier atoms. 2) trace elements are only needed in small amounts. 3) trace elements consist of heavier atoms. 4) main elements are only needed in small amounts.