Since we will be staying largely in B&Bs, is there a cost for fitness facilities

If you want to use a private gymnasium where they are available, yes. In one or two places we stay at there are gym facilities available, though I would make the comment that B&B’s in general don’t include gym facilities. There are often gym and pool facilities close by, but if you’re on a guided tour, you’re welcome to join me on my morning run.. 🙂