I have a friend, Marin, who lives, with her husband, in Honolulu. She has made some exercise videos for us, many of which you will find on the ‘self-help’ page of our website.
Have a look at this set of exercises. They are simple back stretches which most of us can do and will find helpful. Of, course, be careful if you have not done these before and stop if they cause any problems.
Many people find that simple yoga-like stretches can help to keep aches and pains to a minimum.