If you cannot hold a side plank, start off by mastering the side bridge.
Lie on your left side with the knee bent at a 90-degree angle and your elbow underneath your shoulder.
Push your hips forward, lifting your thighs off the ground. Rest the right hand on top of the right hip and hold for 10 seconds. This completes one rep.
Be sure to keep your knees, hips, and upper body aligned. If you experience discomfort in your shoulder, place your right hand over your left shoulder with your fingers spread apart and pull your right elbow down across your chest.
Complete three sets of five reps.
As you begin to feel stronger in your core, increase the sets and reps or advance to the side plank.