For future, please share any thing you find. I have some "quantified self" use cases that I'd like to try out. - Monitor my breathing, nudge me when I'm holdi

For future, please share any thing you find. I have some "quantified self" use cases that I'd like to try out. - Monitor my breathing, nudge me when I'm holding my breath. - Monitor my posture, nudge me as needed. - Real time feedback for learning tai chi, qi gong, etc.