If you like yoga or other mat exercises, then you might be surprised to know that most mats are made of PVC, as are many exercise balls. Gaiam and Barefoot Yoga are two companies that offer alternative materials, like jute and rubber.

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If you use an old-school Walkman or boom box that requires batteries, then look for rechargeable batteries. They may seem expensive until you realize how infrequently they need to be changed compared with disposable batteries. It's definitely important to stay hydrated during your workout, but the plastic bottles that water comes in take up major landfill space. In California alone, nearly 3 million bottles end up in the trash daily. Invest in a stylish, reusable water bottle and refill to save money and landfill space.