This is one from the children dvds by Mikhail. Have one person on his back rise to a bridge or a neck bridge and have the rest crawl under him or in pairs and revers. You can modify the hight and move around if you can to relax in this position and of course learn to use your eyes to see in a place of discomfort. Remember the goal of the drill makes it what it is and brings our body to do the work with effect. Work smart not hard.