you've obviously played no one very good if you havnt ran full speed before. lets break one down.
he hits a wide serve. you backhand it, totally out of court. he hits it wide to the other side. maybe you dont hit full speed here, but your completely out of the court again. and he hits a drop shot, your 110 percent to get to that drop shot. and probably hit full speed to get the first ball if he hit it decent at all.
**Babolat Pure Storm ltd, Wilson Kblade tour
Rubber band member 140