Interesting TED-Ed Animations - Muscles & the Treadmill

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I've been browsing TED talks and I've found some animations you might like. Some of you probably already know the things explained in the videos but they are informative in a funny way.

Thought I'd share them.

https://www.ted.com/talks/christian_moro_the_surprising_reason_our_muscles_get_tired#t-252196

https://www.ted.com/talks/jeffrey_siegel_what_makes_muscles_grow#t-245017

https://www.ted.com/talks/conor_heffernan_the_treadmill_s_dark_and_twisted_past