Lately, I've discovered the wonderful world of Youtube walking videos - you know, just someone walking around a city, capturing the sights, no narration, no music, just the street sounds. When I want to get a little added exercise, I just jog in place in front of the screen and "walk along".
Mostly, I've "walked" in places I have yet to visit in person (or which I expect never to be able to visit...). You can find most any place in the world by entering "place x walking tour". Japan being a dream destination of mine, my favorite channel so far is Video Street View Japan; Yoshi keeps adding new ones all the time:
Another nice one is World Walking Tours:
Please someone tell me that I'm not alone in doing this ;-)