In positions like these, the muscle fibers are activated but since there are equal forces against each other, there is no movement. Instead, you pick one position and hold it. For example, in a plank or wall sit, the muscles are working, but not actively changing lengths. Simply put, an isometric exercise is one that involves muscle engagement without movement. Isometric exercises, also known as static strength training, are contractions of a particular muscle for an extended period of time. Use these Isometric Core Abs Exercises to build a powerful midline and body that will improve performance and prevent injury.
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