Hi guys. I've always been a heel up player, it's always felt more natural to me. I have a double pedal, though I've never been very good with it at all. I want to build and develop my heel down technique, hoping that will improve my pedal chops and playing over all. But it's been really slow going. Part of the problem is the muscle groups used are so different. Any advice on exercises I can do to build these up? I'd love ideas that I can do at my desk at work.