In reply to r fizzle: Sorry I missed the querstionaire.
There was a peice of research done in LJM University, that took a fall training protocol that was in CLIMB, I think it was an old Steve McClure peice. The found that they could reduce anxiety by quite a bit by training people to fall, so it wasn't such an alien experience.
I also like that many people talk about singing on the post. I will argue that this is probably a way that you can created a 'relaxed' mind by singing and at the same time probably altering your breathing.
The use of imagery (visualisation), can also help, as its origins in therapy was to help people with a variety of phobias. Essentially using deep relaxation before a therapist got the patient to then visualise the fearful stimuli. The then reprogrammed the mind to associate the fearful stimuli with the relaxed state rather than a anxious one.
Good luck with the study, would be great if you shared the results.