Is it possible to have too much of a good thing? Dr. Sanjay Gupta breaks down what research says about long-distance training and neurodegenerative diseases. Plus, he reports on which type of field is safer for young athletes to play on: turf or grass.  

This episode was produced by Jesse Remedios. 

Showrunner: Amanda Sealy 

Medical Writer: Andrea Kane 

Senior Producer: Dan Bloom  

Technical Director: Dan Dzula 

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