Eccentric muscle contractions, however, such as steadily extending your arm or lowering to the ground while resisting the pull of gravity are also an important part of isotonic exercise. This is called concentric muscle contraction. We usually think of muscles shortening in isotonic exercise, as when you lift a dumbbell for a bicep curl or rise into a sit-up. Isotonic exercise is movement that requires muscles to resist weight over a range of motion, causing a change to the length of the muscle. In your pursuit of continuous growth, you should look to incorporate both types of exercise into your workout regimen. The two main ways muscles contract are isotonically and isometrically. You can do this in various ways, and different kinds of exercises require different types of muscle contraction. Generally speaking, exercising is moving your body in order to improve your physical health.
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