By practicing drills that emphasize vertical movement, wrist action, and proper body alignment, you can learn to brush the ball thinly and achieve a more effective and powerful kick smash.
This lesson with Sven is great if you're working on your kick smash. He breaks down several drills to help you get the feel for the vertical movement and wrist action needed for a powerful and effective kick smash. It's really useful to see how to practice this shot both on and off the court. These tips can really help you add some spice to your overhead game.