My friend from work tells me he never works out his legs, and i try to tell he should work his legs, but he just doesnt listen to me. he says he runs on the treadmill and thats good enough. What should i tell him. His goal is to get bigger.

tell your friend he may have mental retardation.

Ask him if he thinks arnie ran on a treadmill to get big !

In short, doing squats and leg compounds encourage muscle growth all over the body due to the hormones they release.

Tell him nothing. Then when you are Hyooge you can tell him it was because you worked your legs.

Tell him if he's not gonna work half the body then he can expect half the gains.

My weight lifting partner wonders why I am 6'0 180 pounds with a little gut and faster then him when he is 5'7 130 pounds with his "six-pack". Its because I squat and deadlift.

It amazes me how naive some people are. Tell him he may be strong but he's not actually fit. Throw him on a bike and tell him to go climb a hill. Or better yet, have him read the first line in the first paragraph of this fitness article - "Paired with regular aerobic exercise..."

His legs will be thin and muscular and his cardio will be fine. If he's happy with that good for him. But, if he wants to get big, he's gotta hit the weights. I have never seen a runner with big legs.

To work on your overall symmetry it's essential to do your legs, unless he doesn't mind being top-heavy. His legs play an important role in stability.