THIS
Learn to jog. Work up to sprints. Practice running away. It's fine if you want to exact revenge in the dead of night, but don't ever plan on winning some "gun battle" (oh brother). You run away, and if they crossed a line you get revenge through the courts or through other means.
A lot of people end up getting into gun battles because they let their ego take over.
There's nothing at all wrong with running from some punk, that you could easily whoop, even if he starts it.
Yes, you can whip out your weapon and end it... but legally, you might go to jail. Or he might have the jump on you. Or you might never see his buddy with a gun behind you.
Seriously, if shit is not right in any way, you don't enter, or you get the heck out of there. I bet half the people in prison "wouldn't be" if they would have just stayed home that night, or just backed down from a fight over a girl.