why do bodybuilders use split routines?

[Ursus]

goudy do you think you have to do squats for big quads?

what do you think of this leg routine:

legpress 5-6 sets (pyramid)
leg extension 4-5 sets
leg curl 5-6sets
stiff leg deadlift 4-5 sets (pyramid)

my goal is to have decent quads....upper body is much more important

Squats are best

[First Blood]

Squats are best

yeah i know but i hate em lol...

so just gonna do

leg press
leg ext
leg curl
straight leg deadlifts

for legs...  ...lazy i know..but im thinking that routine will get my legs to a decent size atleast...dont want giant legs lol (dont happen overnight either i know hehe)

[HTexan]

drugs

[First Blood]

drugs

how do you mean?

im not on drugs...im just a guy who likes to workout..mainly focus on upper body