Winter Olympics
Researchers took a detailed look at 17 years of training records for Norway's Marit Bjørgen.
After superhuman efforts, athletes often race again just days later.
Olympic athletes must consider elevation when training.
Sochi's elevation makes speed-skating world records unlikely.
Making the blade turn by itself, and how a "klap" makes skaters go faster.
The proper shaping of a skate's blade is crucial to performance in skating sports.
Gaining speed without going downhill. Wind tunnel research helps athletes slide faster.