Have your client laying on their side with their top leg hanging over the side of the table, and their top arm over head. They can use their other hand to hold the drape over their chest.
Work up the Quadratus Lumborum and up the side of the body with the heel of your hand.
You can also use this position to work into the iliotibial band, the gluteus medius and minimus, and up through the intercostals on the side of the body.
Quadratus Lumborum Soft Tissue Release