After tearing his hamstring at the 1992 Olympics, Derek Redmond refused to quit. With his father's help, he finished the race in one of the Games' most powerful moments.

Derek Redmond's unforgettable finish at the 1992 Olympics When British runner Derek Redmond tore his hamstring at the 1992 Olympics, his race seemed over, until his father ran onto the track to help ...

For many decades, Olympic Games included "demonstration sports." Some, like curling, became part of the permanent roster. But others, like skijoring, didn't stick around.

Here are some of the most unusual Winter Olympic sports in history, from ski ballet and military patrol to dog sled racing and skijoring.