The side plank is a modified version of the plank that works the quadratus lumborum as well as the gluteus medius and tensor fascia lata (TFL). These muscles are important for hip stability.

uq.edu.au Objective In this study, asymmetry relative to the preferred kicking leg was determined if it exists for the psoas and quadratus lumborum muscles among elite Australian Football League (AFL) ...

Forty-seven children (32 girls and 15 boys), aged 10–16 years, were examined. Muscle strength tests showed that m. quadratus lumborum and m. gluteus medius on the convex side of the spinal curvature ...

Pronator quadratus (PQ) muscle is a quadrilateral muscle with attachments at the distal volar aspect of the ulna and radius. [8] Cadaver studies have confirmed the importance of the PQ muscle in ...