McKean et al. (2010 compared lumbar and sacral angles of men and women squatting in narrow and wide stances. Sacrum, lumbar and timing of movement were significantly different between groups (p<0.05). Lumbar flexion for women during narrow squat was 12.9 and wide was 12.6. Men scored in at 26.3 and 25.4 respectively. Men and women clearly developed different movement strategies to solve the same problems. Interestingly, all 30 subjects developed a kyphotic spine when load was place across their shoulders. This may call into question the idea of maintaining a spinal curve and bring the cue closer to neutral spine.

Take home, men and women move differently and their differing abilities must be accounted for in training.