I just watched this great video about the 10 qualities to mental toughness. It was filmed in Santibel FL..Jimmy Connor's home court during the 70's. The video used JC to demonstrate the various qualities while he is playing a match (I think it's an exhibition). The point of this post is that while watching JC's forehand I noticed that both feet are planted on the ground throughout the stroke...there is rotation of the torso but nowhere near the power of today's pros who usually have both feet off the ground when making contact. This change in technique, in my opinion, contributes towards the shorter life span of a top ten player.. His body takes much more abuse and torquing. Any thoughts?