You know you should exercise more, but you just don’t feel like it right now …and you know you won’t feel any different later. That’s why people spend so much brain power trying to make exercise fun, different, or at least not as boring. And an implication that a new technique or device might make it easier or give you better results didn’t hurt a bit as far as popularity and sales go. We’ve seen some really weird exercise trends that came and went that were designed to get you in shape, as John Green explains to us in the latest episode of the List Show from mental_floss.