What if existing just meant breathing?

My friend told me her sentence is “I never overeat”, which I find beautiful and inspiring. But I think it could never be mine. I always need to overeat because I can’t do nothing. Otherwise, it means I’m not being active, productive. That’s unbearable to me. It’s as if I had to justify my existence by doing stuff all the time.
Unless… What if existing just meant breathing? What if I had nothing else to do but breathe?
I already feel much more relaxed, I can look out of the window, enjoy the sounds around me, the people I see…
What do you think?