Stand with feet about shoulder width apart with a plate or similar held in both hands. Bring the weight to the floor outside of one foot. Lift the weight in an arc out and up overhead to the outside of the other foot, bending at the knees and hips slightly as you lower to the floor. The straighter the arms and wider the arc, the more difficult it will be.
 
Purpose
The halfmoon is a multiplanar exercise that’s a simple way to train several aspects of the trunk and hips. It strengthens the trunk in odd positions and motions to help protect it from injury when exposed to unintentional losses of posture or position.
 
Programming
3-4 sets of 5-10 reps to each side at the end of a training session when the trunk will no longer need to support significant loading is a good prescription.
 
Variations
The motion can be slowed down or the weight not allowed to touch the floor to increase difficulty.