Make sure you're writting you're workouts down.

I feel that this is a big deal and I NEVER see people with a journal at the gym. While you're working out you should have a notebook to be writting down all of you're workouts. If you just go in the gym and do whatever how do you know you're results? How do you know if you're getting stronger, whats working for you? It's more than important to do this. Just like taking pictures and taking measurements you NEED to write down you're workouts. If you want to know the kind of progress you're making strength wise AND to know what workouts work the best. Also lets just say you write a new workout, and you're not making progress from it. At least you can go back and say "okay lets switch this back over here and see what happens" so if you're not making progress you know where you went wrong.