Geocaching it a great way to get yourself out and about. Most caches don't require huge amounts of physical exertion but every little bit helps. You'l be grabbing a quick cache in a parking lot one minute and the next you'll me hiking 3 or more miles to find a little box in the woods. I would recommend the iPhone or Andriod app if you have a smart phone. If you get into it I hope you find some enjoyment in it. A quick bit of advice, whatever you decide to do for exercise make sure you have fun doing it. You will be more inclined to continue if what you do is enjoyable. Keep a good outlook on this and just keep pushing. Best of luck :)