If you've ever wanted to combine staying healthy with literature, then you might want to consider walking, biking, swimming, or rowing to Rivendell.
Here's the idea: Karen Fonstad (sadly, when writing up this post, I saw that Karen died in 2005 due to complications from breast cancer) reverse-engineered the route Frodo and Company took on their way to Rivendell in her book The Atlas of Middle-Earth. For example: leaving Bag End, heading west through the gate into a lane, following the lane for a bit, then following the hedgerows south is about a 3 mile trip.
In her Rivendell mileage chart, Karen notes the cumulative miles, miles between each milepost, and the description of each milepost location. So if you are just starting out and log 3 miles on today's run, then you would make a note in your notebook your mileage run for the day and the cumulative miles you have run. That way you can compare your progress against the progress of the Company as they (and you) head to Rivendell.
All this may sound a bit geeky, but it does work---I have started the journey, though extensive, non-fitness travel has kept me away from too much "Hobbit-walking", as my wife calls it. Nevertheless, yesterday I jogged 2.25 miles, which brings my cumulative total to 36.84 miles. On the Rivendell journey, this puts me just beyond that incident with the Black Rider, but before they meet up with the Elves on the Road.

As a final note: in case you are not familiar with Rivendell, Hobbits, or J.R.R. Tolkien, get thee to Amazon and buy the books, or at least the movies
. Getting back into shape can wait until you finish - one has to have priorities.

