Applying Newton's Laws to Exercise: Understanding the Physics of Fitness

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Newton's laws of motion can be directly applied to exercise, illustrating the relationship between force, mass, and acceleration. The first law, inertia, explains how a body at rest remains at rest until acted upon, relevant in exercises that require overcoming initial resistance. The second law emphasizes that the acceleration of an object is proportional to the net force acting on it, which is crucial in understanding how muscles generate force during movement. The third law highlights that for every action, there is an equal and opposite reaction, applicable in various exercises where forces interact, such as pushing against weights. Understanding these principles can clarify the energy dynamics in both dynamic and isometric exercises.
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I was wondering if anybody can help me out on this one.. I am doing a small project that requires me to:

Write how Newtons laws relate to exercise, and give an example for each law.
 
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One problem with this is that muscles use up engery to apply a force, even in the case that no movement is invovled (isometric exercises for example). Relating engery consumed to work done is tough when there are are cases where no work is done but lots of energy is consumed.

Of course there's the Newtonian law that for every force, there's an equal and opposite force (which can produce accelerations). This does apply to most forms of exercise.
 

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