I had to stop using mine when lifting heavy because if I use one to support my back when lifting then I'm probably lifting more than I should. Since I stopped using one altogether I have gotten stronger and now lift far heavier than I ever have before and all without the use of the belt.
USING SP TO HELP YOU KEEP TRACK OF WEIGHT LOSs, CALORIE INTAKE AND EXERCISE "IS" THE SHORTCUT!!!!!!
sTOP TRYING TO CONSUME A MAGIC WEIGHTLOSS PILL, OY!