So I'm doing some basic training of punches in a horse stance after lifting weights and now my fists vibrate at the end of the punch and backfist. Has anyone else experienced after lifting weights. I'm assuming that my arms may be tired from the weights? could it be I'm punching at an angle that is causing my punches to whip? does this happen because the angle is off? I tell ya. I hurt my shoulder early this week and now I got strange new punches. I guess I try again tomorrow before I lift weights to see if the same thing happens before the workout. The only thing really new in my training are the weights.