Woman who have osteoporosis or osteopenia are usually advised by healthcare providers to participate in weight bearing activities as long as they are physically able. Standing yoga poses, such as warrior II, require weight bearing in our legs.
Most other forms of exercise do not put weight on the wrist, a frequent location of osteoporotic fractures. Poses such ass Downward Facing Dog and arm balances do put weight on wrists.
Excess amounts of the stress hormone cortisol decreases bone formation and increases its breakdown. According to Yoga as Medicine yoga has the ability to lower levels of cortisol and therefore may help keep calcium in our bones.
So it seems that yoga is just what the doctor ordered!!