https://www.youtube.com/channel/UC10OPVuU4Ttsu1a9lW5r4Sg/

advanced skills for advanced and intermediate players
https://www.youtube.com/playlist?list=PLbi5LUlkUf6VU2b4Nnd61OlRqGlKSYxMI
qa
https://www.youtube.com/playlist?list=PLbi5LUlkUf6XtLkDiELzJBXeTMIvos125
? serve
https://www.youtube.com/channel/UCXEwSm4OPz3N9OzZw2liUvg
? legs
https://www.youtube.com/watch?v=2Wwv5DW87m4