Hogtied by Elbows: A tight elbow hogtie in full pony gear and hooves. A short clip of me direct link. The elbow hogtie video is also available in 720p.
This position puts an immense amount of pressure on your diaphgram. It's not so bad on your side, but on your stomach, it really makes you feel helpless. You don't even dare stuggle much sue to the lack of oxygen.