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How Boxing Works (0:30)
Boxers get knocked out all the time, but what really happens when they get hit? Find out in this HowStuffWorks video.
Athlete (2:15)
What are the odds your child will become a professional athlete?
How Karate Works (1:13)
Karate is about much more than just strength and speed. Watch this video from HowStuffWorks to see how karate experts can break cinder blocks with their feet.
Human Body: Keeping NASCAR Drivers Cool (2:58)
Temperatures can reach up to 140 degrees Fahrenheit inside the cockpit of a race car. Find out how the human body deals with such extremes in this Discovery Channel video.
Dirty Jobs: Dirty Baseball (1:22)
Watch Mike Rowe slide into first base from the eyes of a lipstick cam.

