In the 1992 Wimbledon final Ivanisevic at the age of 20 is like a stick insect, but by his 2001 Wimbledon win he was definitely alot heavier. He put on alot of muscle while remaining lean the way pros tend to do. How did this happen? I have never heard anything about a regime he went through to put muscle on. Did it improve his game? His serve was a lethal weapon even when he was pencil thin.