What happens when you get hit in the sternum?

Caden, Keeshan, Adrian M. Aidan.

Have you ever had the wind knocked out of you? you can`t breathe. It feels like there is nothing in you and you are being squeezed.
When you get hit in the sternum all the gets pushed out of you. Your diaphragm spasms. This means it stops working. It hurts a lot as it temporarily paralyzes you. Your diaphragm will start working shortly but you will still be scared because there is no oxygen in your lungs. That is one scary feeling.