If you're going to maintain a reasonable level of strength and muscle bulk you've got to have a good weight training routine.
Christine and I go three times a week (when we can). We went this morning and then went out for brunch.
Our routine takes a bit over 40 minutes and you can read all about it in my ebook, Strength Training Diary available at www.globalbackcare.com.
It's a tough assignment keeping your body in reasonable alignment without a good strength training program.
And if it's out of alignment, without strong muscles to support the misalignment you're on a hiding to nothing to come down with some sort of musculo-skeletal dysfunction.
For instance strong trunk muscles, front, back and core act as a corset to brace your spinal column. Without it you're in big strife.
In the meantime stay tuned highly tuned and keep pumping that iron.