This video is not mine, but I am not aware of any copyright issues. It was filmed by Rob Pincus during a class of his, which I was in last year. (this isn't me, I was somewhere else on the line) The video solely belongs to him and I am re-posting this link to it because I highly recommend checking his courses out. He can be found at www.icetraining.us or www.personaldefensenetwork.com

This student is participating in highly dangerous, but highly supervised training that I believe is highly necessary to experience at some point in your shooting career. DO NOT just go to the range or your buddy's house and start doing this. It requires an extremely high degree of safety and a high degree of skill and should be performed only under the guidance of a highly-qaulified, professional instructor.

Experiencing shooting from a wide variety of positions is not something that needs to be done on a weekly basis at the range, but it is definitely something that will allow you to keep your training in context, and prepared you to respond to a wide variety of shooting scenarios from a wide variety of positions. Many other course include supine or some variant of prone or urban prone, but the "Advanced Pistol Handling" course from ICE allows you to experience shooting from just about any possible position. Highly recommended.