yes, what sativus said. plus when you do LST (Low Stress Training) you don't have a perfect verti plant.. when you have a vertical plant and the light above it, then it casts a shadow over the bottom limbs so they grow slower, where as if you do LST, then all parts, or at least most parts, get excellent light. so you increase and maximize your yield. i had to learn how to do this in my first grow cause i let it get way too tall but didn't want to chop it short. you don't have to do it like the one in the picture above, basically you are just tieing the branches and main stem and manipulating them to "slowly" be in another position and it is AMAZING how fast you will see your plant react to it's new position, it is fun to watch!

someone may have a link for you but i would just google the keywords ( LST Low Stress Training ) and search that you'll have way more sites and info on this and why it is good, way more than you really want. it is definately worth reading and trying it once.. it is also a cool artform and i think Topekoms420 would agree that the picture does no justice for how cool the plant look in real life and not concentrating on the strings. take care