You now have a foundation for striking with your hands. When delivering the punches in the preceding section you had a stable foundation because both feet were on the ground when you made contact. This in not the case when using your feet or your knees to strike. In order to kick or deliver a knee strike, you will have to be on one leg for a brief period of time. This requires you to have a certain amount of stability and balance to deliver a solid strike to a target.