SUPERMAN: My brother is bothered...(In so many ways...)

Something has been bothering me for a while that I thought you might know the answer to. I can understand why Superman might be able to leap tall buildings in a single bound (appearing to fly), have bullets bounce off his chest and even his x-ray vision on the theory that gravity on Krypton was so much more intense and, as a result, his physiology would be stronger. So what seemed like normal functions on Krypton (even the "intensity" of his vision) are magnified exponentially on Earth sort of how we function on the moon. But what gives him the ability to just hang in mid-air if we still have gravity here on Earth last time I checked?

Your answers (Kat, Wen, Jason) are appreciated.