hi,
there are so many theories around about active or passive streching that it is very hard to tell the difference between good and bad/stupid/inefective methods.
the best thing imho is not to get a seatbelt but somebody who knows his buisness. that would either be someone from the yoga/tai chi area or somebody working in professional physical therapy or rehabilitation. some friends of mine work in that area and they know more about that topic than anyone else...
most people have a therapist or similar in his/her region availiable. it´s worth the effort...
karsten
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karsten helmholz
bujinkan shinden dojo buchholz/hamburg