The clamshell exercise is a great exercise that helps to strengthen the glutes and improve mobility of the the hips. Clamshells can also help with recovery from knee or low back injury. A few pointers to remember while performing clamshells to ensure you are doing them properly: - Keep knees and feet together while lying on your side. - Have your head supported to keep your spine neutral (a.k.a. good posture positioning) - Knees, hips and shoulder should form a straight line. - Open your knees b