Hi there and welcome!
About legs, you really need to train them, even for upperbody development. Start atleast with light squat and deadlift form work. Here's how to do 'em:
Barbell Full Squat Barbell Deadlift When considering to do squats and deadlifts, you'll have to know that most of the effort, at start all of the effort has to be made on mastering the form. After a few months of good-techniqued squats and deads you'll have alot lesser risk of lower body injuries, more toned legs and butt and a firmer midsection.
Here's a bit of my thoughts on the squat:
Get some light free squat form work as a first thing of a workout (after warm-up, of course). With 3-5 sets of 5-10 reps, and about 1-2 min. rest, without going anywhere near to failure, you can't go wrong.
Squat form: about a shoulder width stance, lower back arched maximally. Get the bar up to your neck, with a narrow grip, elbows to the front. Try to split the floor to your sides with your legs. Arch your upper body also. Get your chest up high, straighten your neck, brace your shoulder blades together and down, and get your elbows to sides of your torso. Try to fire with your glutes. I assure you they won't grow too big and you'll end up not getting knee and low back problems as easily as a usual gym rat training with machines.
If you have problems with keeping the low-back arch and/or if your glutes round forward in the bottom postition, then while getting down, i.e. in the eccentric portion of the lift, don't arch your upper body and get your elbows to the front, as if doing a front squat.
Consentrate on as many points as you can at a time without going nuts. : D
<message edited by Lari on Monday, June 12, 2006 7:54 AM>