![]() According to the principle of specificity, strength is developed in response to the amount of resistance and the type of movements used in an exercise program. The prerequisite for any strength-training program is the structural integrity of the musculoskeletal system to control stability of the stable joints, while allowing the mobile joints to move through unrestricted, multiplanar motion. Both intramuscular coordination (the ability to recruit all of the motor units within a specific muscle) and intermuscular coordination (the ability to have a number of different muscles working together to generate a force) are required to achieve optimal levels of strength. The magnitude and rate of force production are determined by the efficiency at which all of the involved muscle motor units are recruited. 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. From a physiological perspective, strength is the ability to activate muscle motor neurons and their attached muscle fibers (together called a motor unit) to generate the force necessary to achieve a specific outcome. ![]() Generally speaking, strength is the ability to accelerate a mass from a state of rest, which results in the production of muscular force. 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). ![]() For example, training for maximum strength requires heavy weights for limited repetitions, while improving explosive strength requires moving light-to-moderate weights as fast as possible. Are your clients following the right strength-training program to achieve their fitness goals? Increasing muscle strength is a frequently cited reason for starting an exercise program however, not all strength training is the same and achieving a specific strength-training goal requires following the right type of workout program.
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