"The Toms" have it right, lol. Heavy lifting won't really slow you down, as long as your lifting it fast too. Weight lifted, and time took to lift it, are BOTH important if youre trying to keep/increase speed. Sure, if you do slow ass heavy lifting constantly, you'll get bigger and slower. But a good mix of explosive OLY's and explosive/ballistic benches, squats, etc. will speed you up more than slow u down. Try some upper body plyometrics, such as clapping pushups, heavy bag "throws", med ball tosses, etc. Although his genetics play a big part, Mike Tyson is a great example of a guy that looks like an amateur bodybuilder, but has faster hands than a lot of middleweights. Yes, Tyson lifts, but like an athlete, not a bodybuilder, and his speed has only gotten better, it's just his technique that seems to have fallen apart for some reason. No more head movement, no more combos, etc. Okay, Im babbling now, peace