Carefully feel your fingers. Fingers have very little muscle and skin on them, so you can feel the bones easily.

Notice how each finger has three bones. Bend your finger to see the bones and the joints.

Now feel your knuckle bones. These are very different bones from those in your fingers.

Go up your arm feeling for your bones. Check how many you are feeling for by using the diagram on the main screen. Is it more difficult to feel how many bones you have? Why might this be?

Now feel for your ribs. Make sure you can find as many as are on the diagram.