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?

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

Muscular activation

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.

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