A lot of WTA players have the frehand with their upper arm and elbow tucked. Sharapova is a typical example. I also see teenage girls at the local club hit their forehand like that. I think someone mentioned that that's the Bollettierri's way of forehand. On the other hand, a lot of guys at various levels play with their arms extended out more. If you have seen those super slow motion videos of Federer and others, you know exactly what I mean. My question is why there's this difference? What're the pros and cons?