If you look back at some of the old school training tips from back in the 1920's you will see that most of the same things can be held true today. Here are some things the famous Charles Atlas said back in the day:
1. Set a concrete goal-Figure out your end goal and work backwards from it.
2. Never miss a single training session- Remember the whole consistency thing...this is what he was talking about! Always remind yourself why you are working out and stay on track.
3. Treat your body like its a new car- You would not junk up and dirty a new car would you? The answer is no, and you should feel the same way about your body. Take care of yourself by eating good and getting your rest and results will follow.
4. Totally concentrate on the task at hand- There will always be tons of noise and chatter at the gym, so make sure you focus on you and your responsibility to get the best workout in you can. Also, don't worry about what you will be doing later in the workout or even later than day, simply focus on what is right in front of you.
5. Keep stress to a minimum ( or none if possible )- It has been show that stress and anxiety can inhibit muscle growth. The best stress reliever is exercise so make it happen!
6. Drink your water- duh...obvious of course but rarely ever followed well enough.