Strength training is the functional application of Newton's second law of physics, which defines force as the product of a mass and its acceleration (Force = MA). Generally speaking, strength is the ability to accelerate a mass from a state of rest, which results in the production of muscular force. From a physiological perspective, strength is the ability to activate muscle motor neurons and their attached muscle fibers (together called motor units) to generate the force necessary to achieve a specific outcome. To achieve a strength-based goal, it is important to first define the specific type of strength required for success and then design an exercise program to develop that strength.
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