The power of gravity and rebounding nature of the stick when struck over the drum is what I teach my students.  When a drummer uses excessive force to move the stick, this produces unnecessary strain and stress on the body, sticks and drums.  Drumming for me concerns directing the sticks with as little force as possible.  These are some drum lesson videos.  http://westlondon-drumtutor.com/?page_id=523
From West London Drum Tutor, drum lessons in Harrow, Greater London, UK