 EMG Recording Prior to EMG recording, the anatomy and location of the lumbar multifidus muscle will be explained and shown to participants using a model and pictures. Next, participants will lie in prone on an examination table with their arms on the sides. A pillow will be placed under the participants abdomen to flatten the lumbar lordotic curve and an inclinometer will be placed on the lumbosacral junction to ensure the lumbar curve 10 degrees. The spinous processes of the L4-S2 and sacral sulcus will be identified by palpation and marked with an erasable pen. 