Run twice a week (one long slow distance, one interval workout), bike twice a week (10-15 miles each session, or a spin class), swim twice a week (one mile each session -- in open water as long as I can).

Always thought I'd love nothing but running, but I'm surprised: I love the swimming, and am growing to love the biking. And I think the swimming and biking have helped reduce my running-related injuries. This winter, I'm hoping to introduce some yoga to correct my absolute lack of any flexibility.