On a related note, I've been following P90X workout videos for a few months now. They've been really effective for motivating me to workout consistently.

I wonder if "workout videos" for other domains would work to motivate people.

Like, if you wanted to get motivated to work on a side project, you could pop in an hour-long video of some charismatic leader encouraging a bunch of programmers, talking to them, pumping them up, encouraging them, P90X style.