Squat all the way to the ground, touch the bar to your chest on bench presses and lock out fully, and do chin-ups all the way up and all the way down. Hypertrophy is much greater when you use a full range of motion as opposed to partial-range movements. I've been training this way since the beginning, thanks to being taught the basics from my Olympic lifting coaches. I've always done full ROM and I credit it, partly at least, with never having any serious injuries.
Hugo Rivera, About.com's Bodybuilding Guide and ISSA Certified Fitness Trainer, is a nationally-known best-selling author of over 8 books on bodybuilding, weight loss and fitness, including "The Body Sculpting Bible for Men", "The Body Sculpting Bible for Women", "The Hardgainer's Bodybuilding Handbook", and his successful, self published e-book, "Body Re-Engineering". Hugo is also a national level NPC natural bodybuilding champion. Learn more about Hugo Rivera.
There are so many different supplement companies out there with so many different products. Magazines advertise countless products and are endorsed by numerous massive bodybuilders. Maybe the supplements work, maybe they don't. Let's just focus on the essentials that are proven time and time again by people like you and me and spare your wallet in the meantime.
If you’re constantly depriving yourself of the foods you enjoy most, there’s a much greater chance that you’ll simply become discouraged and quit. Figure out what you need in terms of overall daily calories and macronutrients (the level of detail that you apply here is dependent on your individual goals and situation), and then allocate a small percentage of that to allow for the foods you crave most.
For the leg curls, I’d recommend using a different type of leg curl machine than you used in the Lower Body A workout, assuming your gym actually has more than 1 type of leg curl machine. If your gym only has one kind, do it one leg at a time in the A workout, and both legs together in this workout. Or, if preferred, hyperextensions would be fine here as well.
When lifting it is essential to focus your mind completely on the muscle group you are attempting to work on. This makes sure that you are actually using the target muscle to lift the weight rather than accessory muscles or even momentum. This skill will develop with time, and as you progress in making that mind to muscle connection, your workouts will become much more productive and efficient.