Lately, when I do barbell curls with about 145 lbs, I have begun getting shin splint like pain in my forearms. I tried to switch over to the E-Z curl bar, but the pain remains. I train biceps once a week with Needsize's 5X5 routine, and my strength has gone up, but for the last 2-3 weeks the pain remains. I can't even get a good workout in my biceps anymore because my forearms hurt so much I can't go on. What other excersises can I do that will build my biceps but won't hurt my forearms too much. I've tried dumbell curls and preacher curls but the pain remains. Any suggestions?