Get a food scale that offers metric (“gram”) measurements, and use it to measure as much of what you consume as possible.
Measure everything you consume using the metric system. (There’s a reason this is listed twice.)
Get an account on Sparkpeople.com, or any nutrient tracking site / app (Like My Fitness Pal). Use this to plan your meals at the start of each day, and change it as your diet changes throughout the day.
Stay within your calorie and macronutrient ranges.
Own a Foam Roller, and use it often on sore muscles.
Stretch on your days off from training.
Make a conscious effort to improve your posture. This will help you avoid injury, and can lead to dramatic increases in strength.
If you feel like you may falter toward your goals, call your trainer. Often times, talking to someone who is working toward their goals helps “keep you honest.”
Contact your trainer whenever you need to.
Make a schedule / develop a routine and stick to it.
During your warm up, visualize your goals, and forge a strong bond between that vision, your mind, and your muscles.
Use the Trainerize App often to track measurements and workouts.
Encourage those around you. This can help you toward your goals, and also builds a support network.
Leave your ego at the door before training. Doing an exercise correctly is more important the amount of weight you’re moving; Proper posture during cardio is more important than your speed / level of resistance.