What muscle would be considered overactive, leading to the low back arching during the overhead squat assessment?

When assessing the overhead squat, the position of the body and the way muscles engage can reveal imbalances. In this case, if the low back is arching excessively, it indicates that certain muscles may be overactive.

The hip flexor complex, which includes muscles like the iliopsoas, rectus femoris, and sartorius, can contribute to this overactivity. When tight or overactive, these muscles can pull the pelvis forward (anterior pelvic tilt), which in turn increases the arch in the lower back during movements like squats. This can lead to improper mechanics and potential compensation patterns, affecting not only performance but also increasing the risk of injury.

Recognizing the role of the hip flexor complex in this scenario helps in developing strategies for correcting these imbalances through focused stretching and strengthening exercises, thereby improving overall squat form and body mechanics.