The following core exercise examples will add strength and stability to your trunk, legs and shoulders. Try them anywhere from two to six times a week. I like to add them after my dynamic stretch and warm-up. These work great as core activator movements but can also be performed at the end or in the middle of a training sessions.
The reps and sets may vary, but I would try two sets of five to ten repetitions, depending on your needs and abilities. Use common sense. Remember to build the body gradually and intelligently to get the most out of your workout.
My form could be better but you will get the idea. Keep your core stable, don't wobble. The key is to move the limbs while the trunk stays still.