I'm wondering if there is a name for this exercise. I have a bar, sort of like a pull-up bar but set at about 30 inches off the ground within a door frame, from which I hang such that with my arms extended and my body straight, my back is slightly off the ground. From this position, I pull-up on the bar, mostly exercising the biceps. Sort of like a reverse push-up, my body remains straight and pivots off of my feet. Is there a name for this?