The other "show me" muscles include the abs, pecs, and biceps. Quads' counterparts—the hamstrings, the muscles that run along the back of the thigh—are underworked, ultimately leading to imbalances ...

Your quadriceps are a group of four muscles ... so your knee straightens. The other muscle in this group, the rectus femoris, actually originates on the front of your pelvis.

Objective: To investigate atrophy and weakness of the quadriceps femoris muscle group in patients with PFPS using measures of cross-sectional area and peak extension torque. Methods: A total of 57 ...