The document describes exercises to strengthen the core muscles. It defines the core muscles as those that move or stabilize the lumbar-pelvic and hip complex, including the lumbar spine, abdominal region, pelvis, and hip joint. It then explains and provides instructions for four core exercises: front plank, side plank, glute bridge, and Superman. The front plank involves maintaining a straight body position on the forearms and toes to work the abdominal muscles. The side plank challenges the obliques and improves balance and stability. The glute bridge enhances core stability while targeting the abdominal, lower back, and hip muscles. Superman involves raising and holding opposite arm and leg to work the entire back side of the body.