@RIVETPA - I agree completely -- challenges don't have to be crazy difficult. My personal challenge is to create and continue a streak of walking at least 1 mile a day, each day, despite weather and so on. Hard. Always other things to do. But I want to extend that streak, so I keep trying. I think the streak is the motivation. I don't expect to become a sleek, sexy hearthrob from walking a mile a day. But owning the streak would be nice.
Guys -- what works for you?