Planetary Society logo
  • “Exploration is in our nature.” - Carl Sagan

Planetary Video

Why Does Exercise Make You Tired?--Consider the Following With Bill Nye

This content is hosted by a third party (youtube.com), which uses marketing cookies. Please accept marketing cookies to watch this video.

Why Does Exercise Make You Tired? Bill Nye works out the answer in this not quite exhaustive examination of how using our muscles makes us crave a little rest.