Re: "You have to wear a belt"
using the belt allows the lifter to get away with not focusing on keeping their abs and back tight throughout a lift. This leads to bad habbits and injuries if they ever lift without the belt. It gives them a false sense of acomplishment and an inflated opinion of where their strength is so that if they ever lift a heavy object without a belt they are more likly to hurt themselves. Now if you are experienced and know to keep the abs and back tight then wearing a belt for heavy use probably isnt a bad thing, but for learning id say not too.
The only people i see wearing a belt have bad form and think the belt will fix their problems... silly globo gym heads