Well, yes absolutely true, tai chi chuan and yoga, also pilates are the best, not only for siatic pain, is good for everything. Movement is. Back to cannabis, here in argentina we have graduate students in medicine, here you can be a surgeon as you can be a cannabis doctor, mostly pain oriented. There is no tratment that is a panacea but as you recomend ibuprofen, I rather will give someone weed instead, aiming to painkiller dosage reduction.
My point is that the more you can do for your body, facing to better overall results, is the way to go.