107K views · 503 reactions | 4 Ways To Hit A Two-Handed Backhand  1. Racket drops early (Venus Williams style) good for producing topspin and easy to time but lacks power  2. Racket straight back (Hewitt style) good for timing and dealing with fast balls 3. Racket above the grip (Djokovic style) great for producing power  4. Racket directly above grip (Sharapova style) allows for maximum room to build acceleration but timing suffers  | Top Tennis Training | Facebook

38K views · 199 reactions | The tennis racket theorem or intermediate axis theorem is a result in classical mechanics describing the movement of a rigid body with three distinct principal moments of inertia. It is also dubbed the Dzhanibekov effect, after Russian cosmonaut Vladimir Dzhanibekov who discovered the theorem's consequences while in space in 1985. #Space #InternationSpaceStation #Dzhanibekov | Now Science News | Facebook