Great question! I am about in the same boat as you. I do a lot of resistance work but focused more on my glutes and quads. The upper body work I do has been more for bursitis in my arms but I recently started Romanian Dead Lifts using a 10lb weight in each hand. Then I got my dexa results. Hips ok, spine. -3.4. I was a bit shocked. My back is straight and I haven't lost any height. So I'm still doing the lifts. This video linked looks like a good source so I'll continue watching that and see if I get any information.