It's easy to focus your ab workouts on the muscles you can spot in the mirror. But just as important for core strength and overall function are the muscles we can't see in our own reflection.

loss of outline of the left kidney and psoas muscle; irregularity or localized indentation of the greater curvature of the stomach; fracture of one or more of the ribs on the left lower side ...

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) ...