How you stand on two legs

Standing upright is a balancing act. Meet the bones and muscles that make walking on two legs possible.

6 minutes · 7 stops · Supporter tour

1. A weight-bearing bowl

   Your pelvis carries the weight of everything above it and passes it to your legs. Its deep hip sockets hold the heads of your thigh bones much more securely than your shoulder holds your arm.

2. The biggest muscle
3. Keeping your hips level
4. The longest bone
5. Locking the knee
6. The second heart
7. Springs in your feet

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