Weak knees? This might be the reason. The muscles surrounding your knee, quads, hamstrings, glutes, do most of the stabilizing work the joint itself can't do alone. When they're weak or imbalanced, the knee absorbs stress it wasn't designed to handle. Quick win: try this today. Straight leg raises, wall sits, and glute bridges, 3 sets of 10-15 reps, 3x a week. Comment STRONG for our free Knee Strengthening Guide.