Lifting my whole life? Try just before soccer season and light throughout cross country season (low weight high rep) and in weightlifting class. Then massive ammounts of push ups, sit ups, and pull ups along with running including hill reps and stadiums in the off season.
What looks abnormal is when someone has big Bicepts and ripped tricepts and a triangular torso with pecs as big as some girl's busts then their legs are moderate and untoned.
Wether or not you carry 300lbs around all day long or not, lifting freqeights tones in areas walking and carying things do not because it is a specific controlled motion. I'm no expert lifter by any means, but I'm sure any experenced lifter will tell you to work your body evenly. Dont focus on just one thing all the time. Alternate between upper and lower body to allow each 48hs to recover between work outs, have one recovery day a week, an the occasional circut work out along with aerobics (wether it be running, swimming, or even speed lifting) is the best way to improve and keep fit. Look at a compedetive weightlifters work out schedule and physique and then look at a body builder's work out and physique. You do NOT want to be like the body builder. Their bodys are misproportioned and unnaturally toned. Dont let that happen to you.
Or you can throw what I say out o the window and go about your business...I really dont care. Either way, using perfomrance enhancing substances is as bad as cheating.