Pre and post work out. Make sure your jerking off to muscely woman (this will stimulate muscle growth) ensure to sip on protein shake simultaneously for maximum gains.
Go to the toilet just before you're about to lift, get a woody and toss until you're almost there. Then stop, run into the gym, and perform the lift. I actually got a big deadlift PB by doing this. Was going to do it in a powerlifting competition but couldn't time it right.