Flexing Muscles Collection

Man balancing on one foot, kneeling, other foot stretched out, hand behind back, other hand touching outstretched leg, illustration of his muscles and skeleton overlaid on body

Arm flexing bicep with arm bones and bicep revealed

Foot flexed with bones and relevant muscle revealed

Cartoon representing thymus pointing at white blood cells flexing muscles

Diagram showing bones inside human leg, leaping forward

Illustration of flexed muscles in arm

Man flexing muscles

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