Editor's Note: Most of the activities profiled in this Special Report are extremely dangerous and are performed or closely monitored by highly trained individuals. You should not attempt them yourself.
How is it possible to lay on a bed of nails and not be injured? CNN's Dr. Sanjay Gupta explains the "trick" behind the feat. PLAY VIDEO
The sport of free diving requires the ability to hold your breath for long periods of time. CNN's Dr. Sanjay Gupta learns how long he can hold out. PLAY VIDEO
CNN's Dr. Sanjay Gupta introduces us to some people who challenge themselves in extreme ways -- testing the limits of their strength and spirit. PLAY VIDEO
Watch some of the humorous moments from CNN's 'Life Beyond Limits' with Dr. Sanjay Gupta. PLAY VIDEO
CNN's Dr. Sanjay Gupta learns the secrets behind walking on glass. PLAY VIDEO
CNN's Dr. Sanjay Gupta takes on the challenge of high altitude athletics. PLAY VIDEO
Why do some people strive to become explorers? CNN's Dr. Sanjay Gupta investigates. PLAY VIDEO
CNN's Dr. Sanjay Gupta embraces the flame as he learns to breath fire. PLAY VIDEO
CNN's Dr. Sanjay Gupta learns to eat fire as he explores 'Life Beyond Limits.'
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CNN's Dr. Sanjay Gupta explains the science behind a nail in the nose.
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