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The term "isokinetic" refers to a type of exercise in which the muscle contracts at a constant speed throughout its range of motion. This means that the resistance the muscle encounters varies depending on the effort being exerted, but the velocity of the movement remains unchanged. Isokinetic training is commonly used in rehabilitation and athletic training because it allows for targeted muscle strengthening while minimizing the risk of injury, as the resistance adjusts to the force applied by the muscle.

This form of exercise is particularly beneficial because it can help improve muscle strength, endurance, and power in a controlled manner, providing an effective tool for athletes recovering from injury or looking to enhance their performance. As a result, option B accurately captures the essence of isokinetic exercise and its application in the context of athletic training. Other options do not encompass the definition as specifically, focusing instead on different types of muscle actions or training methods that don’t align with the concept of maintaining a constant speed.