After collapsing at work, I spent 3 months practicing shinrin-yoku (Japanese forest therapy). Research shows trees emit phytoncides that boost immunity by 40% (Nippon Medical School). My routine: 1) Walk slowly 2) Touch bark with eyes closed 3) Breathe deeply near waterfalls. No forests nearby? Even 20 minutes in a park lowers cortisol by 15%. Nature is medicine.