Have you ever wondered how many backflips are actually possible for a rider to pull off? Neither have I. I thought 2 was crazy enough. But, there’s a new blog out called Extreme Sports Physics where this guy turns skating, bmxing and fmx into math. Not that cool, right? Well, it’s actually a little more interesting than you might think. This guy claims that according to the laws of physics it will be possible for future Travis Pastranas to pull off 4 backflips. That’s right: 4. Not 3. Not 5. 4. Wonder how he came to that conclusion? You can check his math at http://extremesportsphysics.blogspot.com.