is this a sticky, its on teh first page and yet it hasnt been responded to in two years. But Im going to say deadlift for me...
when i started deadlifting within one month my bi's grew, my back grew, my legs grew, my ass grew, abs grew, traps EXPLODED, delts grew, I mean i didnt even realize that i used half of the muscles that grew.... but my body REALLY responded to having to deadlift alot of weight, wierd but awesome....
squats helped my lower body but i believe upper body makes ur physique look alot more different then lower body to the average person.