If you are doing that, the jab has no power in it. Pivoting your foot or stepping with the jab is what gives it power. It doesn't take away the time it takes to punch either, but if you don't put at least some weight behind it, it won't even work as a distraction.
That's true in kempo, boxing and kickboxing, I can't imagine it's different for MMA.
If you've got 7 bucks, I would absolutely recommend this book. It's by my favorite boxer, so I might be biased, but everyone I've recommended reading it loved it, and learned a lot about how to improve their own boxing.
https://www.amazon.com/Championship-Fighting-Explosive-Punching-Aggressive/dp/1501111485
Thank you for the information about the book.
This is my experience it may be different than yours.
I agree you are not going to knock someone out with a snap punch.
I was taught to jump or step forward and snap punch.
Pivoting the foot and moving the hips and reverse punch.
Body positions when punch is made makes a difference in the power of the punch.
example: is he running into your punch or away from your punch.
I have broken a guy's nose stepping backwards panting my feet while he was moving forwards with a snap punch.
I have broken a board with my body stationary with a snap punch.
So I believe some power can be generated without body movement.
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