Bicycles are an eco friendly part of a healthy planet and healthy people. Bicycling burns calories, increases strength and improves cardiovascular fitness. Riding is a great stress reliever and there are some days and some rides that are capable of launching you into a state of zen like calm. Cycling is a natural high, just ask any giggling child who just got off training wheels. If you are into sustainable living and other good for the planet things, have a look here. That site has some great companies (many in the USA) that are making organic clothing and other eco friendly products for healthy lifestyles.