This article is from the Hardgainer Bodybuilding & Weightlifting FAQ, by Frank J. Kelly and Craig R. Sadler with numerous contributions by others.
Unless you are entering competitions, you should
avoid knee wraps, and the use of a weight-lifting belt which
protects the back. If your back is prone to injury, avoid these lifts
as they are very strenuous. But if you squat and you NEED a belt,
then you should try to improve your squatting technique and
the belt will become unnecessary. The belt will only impede the
deep 'abdominal' breathing required to get through a tough squatting
session. Wearing a belt in the DL may be more acceptable, especially
for reps less than 6, but if you can use the DL in good style without
it, drop the belt.
FIRST AND FOREMOST YOU MUST GET YOUR TECHNIQUE CORRECT.
Wrist straps are OK for the DL and SLD, but as
with the belt, if you can work without it, do so. If you are competing
do the DL without gloves to get used to the rigours of the lift,
but otherwise gloves are okay.
 
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