As well as physio Margaret Martin’s classes on Amazon Prime for people with Osteoporosis (you can have a private class &/or daily emails too) here’s a link to Dr Paul Lam’s Thai Chi Classes tailored for us...
taichiforhealthinstitute.or...
They are both really excellent teachers.
Osteoporosis and static bike exercise 
Cambridge area OP exercise class?
Exercise for osteopenia and osteoporosis
FDA approves first-in-class osteoporosis drug
OSTEOPOROSIS
