For a long time scientists have treated the power of an action as being just dependent on thealignment of force and velocity, however this turns out not to be the whole story when the toolsof calculus are applied to studying the problem. The full picture is important because, e.g., itcompletely explains the coupling between mass and mechanical power expression which is wellunderstood by the sports science community from an empirical basis, but not a theoretical one.Furthermore, there are additional mass-flow dependent terms which show up that are relevant tocontact athletes, e.g., wrestlers, American football players, basketball, as well as dancers, and figureskaters, who will find their center of mass becoming entangled with another on short time-scalesduring contests. Additionally, these mass-flow terms are potentially relevant to every moment ofindividual motion as it is known that individual mass fluctuates throughout a day. Lastly, theappearance of jerk, which is connected to the onset of chaos, and the generality of the physics makesthis work of theoretical interest to academic physicists.