In praise of muscles:

Muscle as the source of kinetic energy for human movement and activity?

Why did I like drawing muscles as a kid?

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Name one superhero who doesn’t have muscles. Including both women AND male superheroes.

Muscular activation

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My theory:

When we see muscles in motion in a photo of art work painting or sculpture, it puts motion and movement into our own real muscles.

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Study art works which put energy and motion into your legs!