Lightly used yoga mats can be difficult to recycle. There are websites dedicated to interesting upcycling ideas, like cutting mats to make jar openers or a mouse pad for your computer, but the reality is that you can recycle your mat, and you should. On the website theboldermatcompany.com, the retailer has identified charities all over the United States that have a need for the mats. They're used for a whole host of purposes -- everything from extra padding for dog beds in shelters to free yoga and meditation classes for at-risk youth. And when buying a new yoga mat, look for ones made from recycled rubber or hemp.