Recently, I requested 'clearance' from my neuro-muscular specialist to return to skydiving. After beginning to feel much better and what I believed was a reasonable length of time, to recover from a moderate lower back injury. Much to my surprise, my physician (who does not and never has tried the sport) said everything looks good from her end, and she sees no reason why not. But suggested I 'test the waters' in a much safer way suggesting I first, check how my lower lumbar (where the injury originated) responds to the skydiving simulation of the wind tunnel. I was stunned by her knowledge on the subject, since she's not in the sport and a bit ashamed that I hadn't thought of it myself. (of course she now holds the highest score on my 'I never knew you were this cool-O-meter) As much as I respect and agree with her advice, I would like to hear the opinions and advice from some of you that may or may not have had, similar injuries and wind tunnel experience. Sounds like great advice, but any opinions on how many 'wind tunnel tests' would be sufficent? I would like to hear what you think. Hit me with your best shot.