A double jointed muscle (one that crosses two joints) can reach a length at which it cannot produce a significant amount of force.  This condition is called “actively insufficient”.  For example, when on tries to achieve full hip extension, while maintaining full knee flexion…the hamstrings (double jointed muscle) are unable to shorten enough to produce a full range of motion of both the knee and hip at the same time.

CategoryMuscle Anatomy

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