The Aerial Skier exercise works your shoulders, triceps, abs, butt and hamstrings.
Hinge forward and lift one leg behind you so that your body forms a straight line. Maintaining this position throughout, extend your arms behind you pressing the weights up. Bring the weights back towards your chest and repeat. Keep your arms glue to your ribs while you're doing this. Do ten reps, switch legs and repeat. Do two sets total.