I was sitting at my desk today and happened to turn around when the kids came down for lunch. When I did this, I saw that my son was moving down the stairs much faster than he should have been able to.
Upon asking, I found that he’s learned to do this:
Ryan Markel 
Hahaha. That is awesome. I can imagine your face when you see him out the corner of your eye moving all too quickly!
Your kid rules.