Kick the shuttlecock inward-this action should focus on the height of the knee joint that the foot needs to kick, and it is not enough to pat the foot with your hand. It is best to reach the height of the knee joint parallel to the hip. But if your hip joint is not flexible enough, you don't have to force it up, just step by step.

Kick the shuttlecock outward-the point of this action is to keep the core stable and not shake it back and forth. Similarly, the height of leg lifting should reach the standard, not just touching hands. It's almost the same if your toes are flush with your hips. If you don't reach the height of side kick, you can't train the side abdominal muscles.

Wipe the shuttlecock-the key point of this action is not to kick your ass when your feet are lifted, but to have a rubbing action when you lift them. It is also difficult to maintain core stability. Don't give up if you can't do it at first!