Running is the cheapest form of exercise (you can buy a treadmill to do so). If you run in the streets, well, it's considered free. Anyway, running is one of the best basic exercises. It does not only burn calories but it strengthens your cardiovascular muscles. It gives the human body its prime shape.
Though running can be done anywhere for FREE, most runners have developed it into a serious hobby. They run the free open space with a runners gear and even gadgets. They like to run comfortably and fashionably.
Speaking of gears for runners, I have found a site that caters to runners need. Not only in gears but also in customized services for personalized shoes and orthotics. The name of the site is The Running Institute of San Diego. Their site offers helpful articles on topics that involves running like running shoes, trail running shoes, knee injuries and health. They also sell all kinds of running shoes, shorts, shirts, gels and hydration drinks.
If you want to know more about running or interested to buy new running shoes, you can visit them at www.sdri.net. I am sure you'll find good buys there.