Hi Cathe - I love the PS tapes and I always find that they wipe me out, but I'm having some trouble with the concentration curls. I don't think I'm feeling the bicep bulge and contract like it needs to. I don't "feel the burn" on these like I "want" to. I don't know if I don't have my elbow in the right position, or if I'm holding the weight at the wrong angle or what. Which end of the dumbbell is supposed to be closest to your shoulder - the outside edge or the edge closest to the body (if that makes sense) Do you have any form pointers to share that would help me?