So why does your back still hurt?
I see young guys come in all the time and exactly the same, they start curling with the worst techniques; lifting shoulders, throwing their backs, moving elbows etc I want to say something to them but not to fix their technique... more rather to stop curling and stick to the basics for a while, bench, lat pull downs, uprights, deads (although daunting for newbies) and yes squats! I reckon that's the BEST advice you can give them, fark trying to tell them how to curl!!!!