If you're going to make working out a regular part of your life, you might need some gear—even go-anywhere workouts like yoga are easier with a mat, and a biking routine is impossible without a bike.
But you don't have to buy all new products. Check the Web or your local sporting goods store (or your closet) for deals on used bikes, weights and other equipment. Eco-friendly yoga mats, which are made of non-PVC materials, are easy to find. And you might be surprised at how good your workout can be two water-filled jugs, a dining room chair and an old crate.