Jay, my post was misleading, I should include that before 225 I do one set with just the bar, and then one set of 10 at 135, but I never include those because I always think of it as more of a stretching warmup than anything else. I don't think jumping right to 225 would fare well for me...grin
I do the same with bench and deadlifts-one stretch/muscle waker-upper at 135 and then jump into the "warm-up" sets.
