Toy lecture

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Haarlem, today. Toy leg with well defined calf muscles found on the beach.

The gastrocnemius and soleus muscles -- the calf muscles -- unite into one band of tissue, which becomes the Achilles tendon at the low end of the calf. It is a fibrous tissue that connects the calf muscles to the heel bone.

During walking, running and jumping the calf muscle pulls the heel up to allow forward movement.