The function of muscle is to pull and not to push, except in the case of the genitals and the tongue.

Leonardo Da Vinci
About This Quote

The function of muscle is to pull and not to push, except in the case of the genitals and the tongue. The phrase, “the function of muscle is to pull and not to push,” was said by the great scientist and essayist Richard Feynman. He used this phrase in a 1965 speech to describe why we lift weights: to build strength and increase our ability to move objects. He goes on, however, and explains that muscles can also produce force by pushing:

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