Primarily, planks recruit your transverse abdominus (deep core muscles), rectus abdominis (front abdominal muscle), external ...

They should focus on maintaining a straight line from the knees to the shoulders. The side plank is a modified version of the plank that works the quadratus lumborum as well as the gluteus medius ...

Common causes of pain on the left side of the body include infection and injury to muscles, nerves, or internal organs, such as the heart, spleen, left lung or kidney, pancreas, and more.