It's been said that you can bend your front leg to gain a few inches in your jab. It's like the fencing move, and a few guys in the amateurs and even Andre Ward who won the gold medal in the olympicswas able to pick up points with it. I can understand that it can be a big problem in the pro's, and there's also the problem with commiting to the shot.

I tried the straight front leg and shifting my weight to it and around from Edwin Haislet's book. It really helps bring more power into a shot.