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Newton Knows Best

Newton's three laws relate to most any exercise we do. I will give three specific examples of how these laws apply to the motions involved with working out.

Newton's first law states that "There are two types of Inertia, resting and moving. When an object is at rest, it will stay at rest unless acted upon by some outside force." For example, a loaded barbell lying on the ground has resting inertia. In order to move the said weight, you must apply a force greater than that of the weight. Furthermore, "When an object is in motion, it will remain in motion unless acted upon by an outside force. " An example of this would be a lateral arm raise with straight arms and not much weight. The weight goes up without a lot of effort. However, on the way down you must tense up and keep stable by exerting force so the weight does not stop its motion by landing on you. If you were to throw a heavy weight, it would continue on its path until stopped by a greater force, like a wall or the ground.

Newton's second law has to do with force and its relationship to mass and acceleration. "In order to create a force, you must place a mass into motion with acceleration and a change in velocity (M*V= momentum). When using weight stacks on cables, one must adjust their speed of movement to how fast the weights move up and down. When muscles generate a force, there must be acceleration of the weight. The speed of the object has to be increasing to be a true force.

The third and final law explains equal and opposite reactions. "Objects in contact exert equal and opposite forces on each other." While doing a push-up, you must push against the ground with your hands. The floor in turn pushes back. The result is the raising of your trunk, which is reactive force.

When exercising the most important rule to remember is that every action has a reaction. The three laws demonstrate why and how your body adapts to exercise. So keep in mind that if you want to be in good shape you have to move and be a force.

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