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The official channel of the France 3 show. C'est pas sorcier, the magazine of discovery and science. What is a muscle made of? What causes it to contract or relax? Why are some people as flexible as cats, while others are stiff as brooms? Between dance classes and gymnastics sessions, Fred, Jamy and Sabine introduce us to the functioning of actin and myosin strands which are the essential hinges of strength and flexibility. Our three friends explain the secrets of successful training. Flexion! Extension!