Illegal Serve Path: High-to-Low Without Coming Back Up
Aylex demonstrates the illegal paddle motion many players sneak onto serves: a clear high-to-low chop that never returns upward. Stopping in the downward path is a fault.
Legal Slice Serve: High-to-Low Must Finish Upward
Aylex clears a myth: you can put topspin, slice, or sidespin on a (drop) serve. What matters is the paddle path still includes an upward arc.