You want to know how to apply BT to your shooting. Honestly, I don't know. I learned to shoot with back tension years ago and it's so ingrained that it's there, whatever I'm shooting. Whether I'm applying slow, deliberate tension on a release trigger in a tournament, or swinging through a snap shot at a running rabbit with my recurve. You just work on it until it becomes a natural part of your everyday shooting form and it applies itself.

At least, that's what happened to me. Maybe it's different for different folks.