don't worry about the back pain that's god punishing you. did you bend your knees slightly during the standing curls? for fucksake man.

http://www.ehow.com/how_2212681_do-standing-barbell-curls.html

i estimate 90% of the injuries i've had were due to bad form, and the other 10% were due to drunk driving - ten years now and i still can't shake the image of that crumpled baby stroller in the rearview, laying there in the crosswalk like a pile of mashed potatoes. no movement at all. i was okay though, only a minor neck injury from whipping around so fast to see.