He landed square on his head while doing a flip he had pulled off many times.
Valdes dislocated his neck and herniated his spinal cord.
It should have been a paralyzing injury, but doctors were able to decompress and realign his neck.
Valdes is now wearing a neck brace but expecting a full recovery.
"I was very scared. I was pretty sure I wasn't going to be able to walk at least for a while," Valdes said.