To all - my regimen this winter has toned muscles, improved breathing and flexibility. For 5 months -
3 times weekly 45 minutes "senior yoga" -slow controlled movement, some seated and some standing with stress on balance and flexibility
2 times weekly light weights with slowly increasing reps (limited by arthritis)
4-5 times weekly walking 1-3 miles. Pace varies day to day based on walking partners and goals.

Don't discount the value of yard and housework- weeding, mowing, sweeping and cleaning can all be done at an aerobic pace!