  Lower leg amputees used to be excluded from competitive running because their prostheses made them run too slowly. Now new materials and designs have created specially springy sports feet that permit their wearers, when very skilled and talented, to run as fast as can be done with fleshly feet. A hit-and-run driver's victim, Dory Selinger now bicycles with a cleated peg replacing an amputated foot. Because it does not flex, the peg is more efficient at pedaling than a fleshly foot. Selinger's best time is only four seconds off the longstanding world record for “normal” racers (Squatrighlia 2001).