Here is my best advice: If you have a basement that you will be using, start walking up and down steps whenever you can at work. This has been my biggest obstacle since retirement. I bet I am up and down the basement steps 10 to 20 times a day. I was not prepared when I retired, it just about did me in! Also, take your time before you leap into too much. And, practice saying "no". I came from a very stressful job and spent the first summer drinking coffee on the deck and just trying to relax. It is worth it!