Jane, I'm reading a book that may interest you. It's DYNAMIC AGING by Katy Bowman. I was interested in her book KATY SAYS, but it was out of print at that time and I couldn't find an affordable copy. That book is now back in print, but DYNAMIC AGING is really more what I was looking for.
According to Ms Bowman, even people who get a lot of exercise aren't really getting enough. She makes a distinction between exercise and movement, and feels we all need to move more. She also says we need to move differently--not just the same exercise over and over. She recommends a series of stretches that look quite easy, but work areas of our bodies that tend to be underexercised. I just started the book, so I can't report of progress one way or another. But I'm certainly anxious to give it a try.