Belly breathing is sending the inhale all the way into the low belly to expand it like a balloon, and exhaling to feel the waist cinch. Strictly belly breathing, with no chest movement at all immobilizes the ribcage and mid back.
Many people ask me -'What exactly is Pilates?'. Boy is that a loaded question! After 15 years of being a Pilates fan, I still can't sum it up in an easy way. And you know why? Because when you 'get into Pilates' you realise how crazy complex it is!