Why do we ask so much noise when we swing a kettlebell? Do we have to feel silly and hiss? Well, yes if you want a more powerful swing.  Here is power breathing demystified.

When you hiss, you cut off the air opening and force yourself to contract your abs to get the air through the small hole. When you contract your abs, your back is protected and you are experiencing hyper-irradiation – the phenomenon that muscles contract harder when they contract together. The more muscles you use, the more weight you can move – who knew?