@imallears I am restricted in using things like powders you mention due to being post-transplant. Many of those things are not very well regulated so are not recommended.
I also go to the gym three days a week, and do three days a week in the water. I was thinking the water may not be much help but I have been noticing that the resistance of the water really does have an impact if you are vigorous, which I am. I do a water aerobics class for an hour and then about another half hour of water jogging. My arms and legs are definitely tired when I am done. Exercise is of course recommended but overall there have not been many studies proving its efficacy, particularly walking. I was reading a book that was recommended to my sister by her doctor, "Strong Women Strong Bones" by Miriam E. Nelson. In it, she speaks of a test group of walkers vs non-walkers and there was no improvement in bone strength with the walkers which is very surprising I think. Of course walking is very good for other things too so even if it is little help for osteoporosis it does help with overall health.
I will listen to the doctor and then do some additional research. My PCP knows that I do not easily take recommendations for drugs. He is not a big advocate of many drugs but right now he is trying to get me to take BP medication. I have given in on the cholesterol medication because my endocrinologist pushed me on that and I trust him very much. I will be seeing a different endocrinologist for my osteoporosis probably and unfortunately, that appointment is not until January. My PCP does have me on vitamin D and I also take calcium that has a little vitamin D in it.

@sue225 It's so ironic that being petite is more of a risk! I was much heavier and all of that extra weight actually helps to keep bones strong. Now I am not very overweight at all so that is an added risk along with taking prednisone, and also taking omeprazole. Omeprazole can cause the calcium to not be as easily absorbed I have read.
JK