Ok this requires two people. One person lays on the ground with their arms stright out in front of them. The other person has to pick up the other persons arms lifting the laying persons head off the ground at least. Hold them up as high as you can and tell them to tell you when the burning in their arms is unbearible. Keep them up for about five more seconds then slowly begin to lower their arms to the ground. Their head should be the first thing to touch the ground. The end result should have their arms straight out in front of them on the ground. Now the thing that makes this special is that while you're lowering their arms it'll feel to the as if their arms are going through the floor straight down. Try it with a friend in you're spare time.