How to properly do a side plank for maximum effectiveness and safety?

To properly do a side plank for maximum effectiveness and safety, start by lying on your side with your elbow directly under your shoulder. Lift your hips off the ground, creating a straight line from your head to your feet. Engage your core muscles and hold the position for 20-30 seconds, then switch sides. Make sure to keep your body in a straight line and avoid sagging or arching your back to prevent injury.