Are you sitting down while you read this? If so, then the Crab Hip Hold is an exercise you must add into your routine. “We sit so much. We sit at breakfast, we sit while driving to work. Being in that position all day, your glutes and hamstrings are never contracted,” Jeremy Frisch, U.S.A.W., owner and director of Achieve Performance Training in Clinton, Massachusetts, and creator of the 24-Hour Arms Workout.