Don’t know if you’re walking your 4 miles at once?? It’s preferred to break that up into maybe 2or 3 different times of the day. Gives your bones a chance to be stimulated more than the once. Know that you need to walk quickly for it to be osteogenic- I’ve read at least 3.1 miles/hour in one resource, where another recommends 3.6. That’s quick!!! Just an aside, long distance running is not the ticket with osteoporosis. I will also tell you that the elliptical will give input but walking is better as your feet are coming down in contact with the ground with each step. On the elliptical your feet are stationary, so not as much stimulation is provided. Exercises that target specific areas for hips, spine , upper extremities etc should be included in your work outs. Some cardio and BALANCE. I see you’re doing yoga. Depending on where you’re at be aware of different positions to avoid.
Happy training!!! Good luck!!

Letting you all know that Margaret Martin PT, well respected in the osteoworld (she is on YouTube, written books, has an extensive website related to exercise for those with osteoporosis, and once a month does a live stream focused on a certain topic regarding exercise) This upcoming Saturday, May 27 she is hosting a live stream where she’ll take any one’s questions. You just have to be affiliated, for free, with her on line presence to receive this type of info of her programs , live stream. Etc …. Go to http://www.melioguide.com

Just listen, or post a question. And if at the time she does it, which is usually at 2 pm EST, you can listen to it , or after the fact if the timing doesn’t work for you. Unfortunately I won’t be able to attend “live”,this Saturday ☹️, but maybe you can and ask your exercise questions!!!