Kick fast: the legs should swing quickly to the face from bottom to top, and there is an acceleration process here. When kicking, sit your hips back and exert your strength on your legs. When you are just practicing kicking, you must always maintain the standard of action. You'd rather kick above your chest than lift the heel of your support leg or bend your knees, or bend your back to touch your toes with your head. All these show that the flexibility training of the legs is not in place and the ligaments have not been pulled apart.
Matters needing attention in ballet
In ballet, there are a lot of stretching movements in the knees, and the muscles of the thighs and calves exert more force. If you don't master the muscle strength and use the joint force, the soft tissue of the knee is easy to be injured or excessively worn, and it is difficult to recover.
Attention should be paid to strengthening muscle strength and weakening the impact of knee joint in time. Once you have knee discomfort, you should stop dancing and rest for a while. When practicing special movements such as weightlifting, women try to wear knee pads.