Feeling the burn while pedaling up hills? Time for the Copenhagen Wheel, a new cycling tool that turns any bike into an electric hybrid. Read on to learn why it might turn all of us into gung-ho bike commuters.
Mobile apps are revolutionizing the way we run faster, get stronger, and eat better. From the silly (zombies!) to the scientific (genetics!) here are the best 64 health and fitness mobile apps of 2013. (And best yet... most of them are free, shhh.)