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.

The Quadratus Lumborum connects the pelvis to the lumbar spine and your floating rib. Its a key player in side bending, extending the spine and breathing — essential things for riding a bike. My QL ...

A certified personal trainer created a workout to melt belly fat and sculpt enviable, toned abs like Rita Ora.