What is the best way to get used to staying in the pocket and trading blows? I have the habit of just backing up as soon as punches are thrown. I see a lot of fighters who can just sit there and block punches without backing up and counter. Or guys like BJ Penn who can just move forward constantly. I'm guessing the best way is just to keep sparring and try to make myself stay in the pocket, but I was hoping someone had some insight that maybe I haven't thought of.