For a few weeks train with really heavy weights. In the next few weeks train with lighter weights. This switching weights helps you to build muscles faster during the low weights phase. Try it you will be amazed.
Throw a medicine ball. Throw it against wall in front of you just like you pass on the basket ball. Do this vigorously. Slam it hard against the floor. This kind of explosive training triggers the central nervous system and brings in more muscles into play when lifting weights.
To look slimmer around your waist, train your deltoid muscles. As your muscles grow bigger you acquire the trim and tapered look of master weight lifters.
Learn how to grow muscles using the right techniques and methods used by experts. Check out Muscle Gaining Secrets by Jason Feruggia at http://musclegainingsecrets2review.wordpress.com/