pulling them down,,,as they are vegging during the grow pull the top of the plant downwards till you feel pressure"like its going snap" then stop,the following week do the same,they key is to keep the plant from growing vertical and to allow the branches to grow upwards / < im using that as the stalk eventually it will lay flat and the branches will grow into main colas wich gives you more yeild,then you can also pull the branches and allow more growth...

its hard to explain but easilly done,do it when they get about 3 foot tall and the stalk is still soft i use twine tieing it loosley to the middle of the stalk and pull downwards,after a week the upper portion obove the twine can be pulled downwards again,eventually you will end up with a plant that looks like a sideways L with a bunch of branches growing....