Share 'What is angular momentum and why do Federer, Nadal and Djokovic use it?'

We hear often that the new mechanics in tennis is the "modern forehand". What makes for the "modern"? Then there is invariably the mention of angular momentum. How does this apply to tennis?  There has been a change in how the forehand swing is shaped, and the top guys of today hit the forehand much differently from how the top forehand hitters did in the 1990s. They employ angular momentum. Let…