Muscles have gears which allow them to move fast with less power when carrying something light and slowly but with more power when carrying something heavy. This is similar to how a car in high gear can travel at greater top speeds but will accelerate slower from standstill, whereas a car in a low gear will accelerate much faster from a standstill but not be able to reach very high speeds. The concept is called the architectural gear ratio and it all comes down to how the muscles are structured!

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