@sheilad1, Thanks for starting this discussion. I think it's a great question and something to be aware of before starting an exercise program for bone health. Here's some information I found on the question.

"High-impact weight-bearing exercises help build bones and keep them strong. If you have broken a bone due to osteoporosis or are at risk of breaking a bone, you may need to avoid high-impact exercises. If you’re not sure, you should check with your healthcare provider."
-- Weight-bearing Exercises: https://www.bonehealthandosteoporosis.org/preventing-fractures/exercise-to-stay-healthy/weight-bearing/

Here's another link that you might find helpful:
-- Exercise for Your Bone Health: https://www.bones.nih.gov/health-info/bone/bone-health/exercise/exercise-your-bone-health

Was it your doctor or healthcare provider that told you it has to be weight bearing and high impact or low impact?