shaunche
Member
A weightlifting belt can impair form because it gives a false sense of security. Training without a belt will strengthen the core muscles which support your spine. You should use a belt when you are training really heavy, in the 1-4 rep range.Tell him to make his form better and use a weight lifting belt. His other lifts will suffer from back injuries so stopping deadlift is the easiest way to improve his workouts.
As for the deadlift, when executed properly it is good for your back.