My experience w/ tai chi has been very positive, Thus, I recommend any mser out there to give it a try , whether its standing (as I do) or sitting. The benefits are various and plenty.
Because of repeated used of "progressive", the assumption is made that physical exercise will not be conducive to improvements. I have "drawn a line in the sand" and found that I can retain a level of mobility regardless of the difficulties encountered - once I made the comittment to also change my nutritional/medical regimen. There is a direct corrolation between healthy energy input and movement/mental output.