Thread: Concentration form

I always incorporate concentration curls inmy bicep workout, however, I am a bit worried that maybe my technique is shot to hell!!

I rest my left upper arm (rear) on the inside of my left thigh, which is spread quite far out, pointing away from the rest of my body. My head is in-line with the bicep. My forearm points toward the other leg. I.e - If you were looking directly at me from in front, you would see my whole arm from left-to-right. I curl my arm toward the shoulder. Kind of a side on movement.

I've seen clips and shots of concentrations being performed where the lifter has his arm pointing straight forward and curls upwards toward his chest.

Which technique is correct?...

Cheers guys.