You recycle. You tote your refillable Sigg to the gym. Maybe you even compost or (gasp!) grow your our grub. We get it: You take pride in making sustainable choices-and that's terrific. But have you ever considered that your workout gear could be greener, too? We dug around to find the best-and best-looking-fitness looks that work as hard as you do and are made of eco-friendly materials. Here, our top 15 picks.