I have a very nice Jab myself and technically, it probably is my best punch.
What these guys say about repetition is very true, practice makes perfect. However I have some slight tips to give your Jab a little more "oomph" to it.
My first suggestion would be to turning your left hip to the right slightly when throwing the Jab. This will increase the power of your Jab. It may sound a little confusing, so I'll show you a clip of a Jab with hip movement.
http://www.youtube.com/watch?v=b0msCCnzmNA
His front foot isn't correct and he's twisting his hips too much, but you get the idea. It should be a slight twist of the hips, not putting the whole hips into it, it should be a short twist. Twist too much, and you will compromise the right hand.
This is a good Jab, there is the hip twist and the slight angling off of the head:
http://www.youtube.com/watch?v=Pk7l4...e=channel_page
My last suggestion would be to move in with the Jab. Boxing is about moving in and out and angles, a boxer can have great punching power, but if he can't move well when he punches, he loses A LOT of his effectiveness. Moving in with the hip twist Jab also sets up well for the Cross in the standard Jab, Cross. When you move in with a Jab, it will be strong because you're putting your whole body into it. It is not a "power punch", but it has a lot of power to it. So practice stepping in with a Jab and side stepping (do not go straight back after throwing a Jab)
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