The function of muscle is to pull and not to push, except in the case of the genitals and the tongue.
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About Leonardo da Vinci
Leonardo da Vinci was a medieval Italian renaissance polymath. Leonardo di ser Piero da Vinci was an Italian polymath of the High Renaissance who was active as a painter, draughtsman, engineer, scientist, theorist, sculptor, and architect. While his fame initially rested on his achievements as a painter, he has also become known for his notebooks, in which he made drawings and notes on a variety of subjects, including anatomy, astronomy, botany, cartography, painting, and palaeontology. Read more on Wikipedia →