JACKSONVILLE, FL - MARCH 19: The opening jump ball of the Temple Owls game against the Cornell Big Red during the first round of the 2010 NCAA men's basketball tournament at Jacksonville Veteran's Memorial Arena on March 19, 2010 in Jacksonville, Florida. (Photo by Andy Lyons/Getty Images)

Everyone wants a butt that’s so tight you can bounce a quarter off it, right? Ok, maybe not. But guess what – you probably already have one!

According to a physics professor from Cal State University, Long Beach, the average person most likely has a butt that you can bounce a quarter off.  And it’s not because they’ve got muscular butts, but because butt skin is naturally bouncy.

It’s all based on something called the “coefficient of restitution,” or COR, which measures how well an object will bounce off a surface.  It’s measured on a scale of 0 to 1. If something gets a “1,” it means an object will bounce off it perfectly. And thanks to the tightness of the skin on our butts, the average butt has a COR of 0.82.  That means a quarter SHOULD bounce off a bare butt nicely.

It also means our butts are slightly less bouncy than a ping pong ball, but have more bounce than a basketball.

So can we  stop doing lunges now?