i found some good interesing barbell curling tips over the net

"This is the basic lift everyone knows," says Connors, but it''s absolutely essential for crafting cannonball biceps.

Stand, and grab the barbell so your palms are facing up; your hands should be about shoulder-width apart. In the starting position, your arms should be extended, so the barbell will be at about thigh-level.

Now, with your back straight and your elbows close to your sides, lift the barbell, curling it up toward your collarbone. Lower the barbell back to the starting position—that''s one rep. Keep your wrists straight and do the curl slowly; if you move too fast, your body will start rocking, and momentum will be doing all the work. That''s cheating.



Source:- MOTHER NATURE