I walk into my office the other day and my assistant Cristie says, "I want to deadlift something heavy today!" Now Cristi is a freak- I put videos up of of her under "more freaky strength" on my forum on StrengthVillain.com.She is strong with emphasis on the STRONG. Anyway, its deadlift day and she loves to deadlift. in fact we all do- Big John with his 650, Believin with his 570, Tracy with her 430, me with my 740, its a great group to deadlift with on any day, but when she said that, I knew she was gonna PR. Sometimes, you just FEEL it, you have to go for it, the stars are aligned, your heart is beating a little faster, your muscles are blown up a little more, you feel explosive, you feel ready for anything.
So Cristi's all time best is 430 in a meet, and I told her, alright, lets go 385x2 and 415x2 and see how it looks. She smoked them, leaving trails of dust off of the weights. I had to yell at her not to do a third rep . She then put on 450 and crushed it. She is on her way to 500 plus. Anyway, here is my point- when you feel it, when you know, it, screw the workout, just go for it. It's something instinctual, its your biorythyms or something, but take it, seize it, your body is talking to you. Its a day when the first warmup feels as though it's gonna fly out of your hand.
But it can not be forced. It is there and you know it, or isn't at all. Most days, you are meant to just do the workout as called for, but every 10th workout or so, at least for me, it's time to try something that you haven't done before. Here is her 450x2 http://www.youtube.com/watch?v=39fneW_VUuk