I've only tried cable crossover for 2-3 times, but I have a question on its proper form. My main problem is I feel discomfort in my upper arms, about the end of my side shoulder muscles (with my hand relax at my sides the discomfort will be about midway from my top shoulder to my elbow, between biceps and triceps at the outer side - I hope this is clear). I feel this point is uncomfortably pulled when I am in the end position of the crossover (when the arms are pulled away). I don't know whether this is supposed to be so (that I just have to get use to it, that I will get stronger with time), or whether this is caused by improper form. The way I do this exercise is: begin with standing and a bit bent at waist, pull the handles with both hands, upper arms and forearms at about 90 degree, then move the handles to front with motion like making a hug until both hands meet together (at this point both hands are almost straight, no longer 90 degree between upper and lower arms). I am wondering whether my discomfort can be eliminated by standing at certain position, or degree of bent at waist, or something else with regards to the form?