Eg people who quantify everything about their body
Some examples include Ben Greenfield, Dave Asprey, Brent Nally, Matthew Lake, Dean Pomerleau, Larry Smarr (Larry Smarr Archives - Quantified Self ), the canadian biohacker, and some more examples I’ll list later.
Dan Dascalescu started the original QS forums but they seem dead now, spiritually and emotionally. ;(