The German sneaker and sports apparel maker on Friday began selling the first model of its so-called intelligent footwear, a running shoe known simply as Adidas-1 that's built around an onboard microprocessor. Retailing for $250, the white and gold shoes have the capability, Adidas says, to automatically adjust themselves to respond to a wearer's changing needs for greater or smaller amounts of cushioning around the feet.

Any runner will tell you that the right shoes are key to success. The wrong fit or cushioning can hurt performance and cause injury, while the perfect shoe can help a runner tear up the pavement.