Feeling in the solar plexus

I've been noticing throughout my day a feeling like clearing up and softness throughout my torso like I can breathe better and see better and generally am more relaxed. I was wondering what it is - it would come at random, sitting in class or doing homework etc, I'd notice it especially in conditions that put me under stress because the feeling of ease stands out but it's not necessarily limited to any conditions. It took me a few days to realize it is the absence of a tight feeling in my solar plexus/ cavity that was replaced by ease/emptied?: I know the cavity is already a cavity, but you know what I mean. So far the non-interference training has been a new kind of challenge and it's much harder but I'm doing less. It's been a rewarding challenge and it's affecting ie improving all different parts of my life.

Infographic on meditation benefits