to belt or not to belt:
this question comes up so often on this forum and the answers change everytime

this is ok. most advice is good when applied appropriately.
my take again (and it is sort of revised from last time i answered).
belts definitely add weight to the amount of weight you can use in an exercise. i think this is for 3 reasons.
1. the lower back gives out early (weak core)
2. using a belt changes the mechanics of the lift, shifting the load to stronger muscles.
3. psychological/confidence. the tighter i feel, the easier a lift seems for me.
what i now do is the following.
on 2nd half of speed squats and subsequent heavies, i use a belt.
on all my full deadlifts i use a belt. this is not really because i am weaker, but because putting on a belt makes the movement less comfortable for me. i *need* to get used to the feel. it is definitely a different movement.
on other ME exercises..... i vary whether or not i use a belt. i usually try and work up to a semi-hard triple without a belt. every time i repeat an exercise, i try and up this beltless PR by a little bit. i then, if feeling good, throw a belt on and work up to a max single. in a way, this is giving me 2 prs for the workout. the difference is that the beltless PR is not REALLY pushing it. i have yet to fail on this one, and I'd like to keep it this way.
good luck.
/irish