Idaho, there are many styles of back tension releases and they all look different. The difference between a back tension release and a normal release is that you do not consciously trigger the release. Instead of using your finger to pull a trigger you squeeze your back muscles while aiming to make the release go off. It sounds strange to those who have not heard of them but it can make your shooting more accurate by eliminating the tension cause by anticipating the shot. When I shoot I do not know exactly when the release is going to go off so I can focus on aiming.

Here is a link if you want to see some:
http://www.carterenterprises.com/products/target4.htm