In the front leg, the increased hip flexion makes it more challenging to maintain abductions and external rotation in the leg, which keeps the knee from falling inward or the hip from swinging out.

The increased hip flexion does make it possible for the lower side of the body to stay long and for the spine to maintain its neutral length. If there is not enough hip flexion, the spine will flex laterally.

The upper arm, spine, and back leg from one continuous diagonal line. It can be challenging to keep the spine in line with the leg in this position and not to flex in the back hip joint.