Walking and yoga are excellent for your bone strength, although make sure you are not doing any crazy poses in the yoga class that may be dangerous to your spine.
Ukuhamba nokwenza iyoga kuyanceda kakhulu ukomeleza amathambo akho, kodwa kufuneka uqinisekise ukuba xa usenza iyoga akumi ngendlela ebeka umqolo wakho emngciphekweni.