... apps that just count seconds, O2 uses real apnea training methods CO2 and O2 tables that adapt to your personal best. The app tests your max breath hold, then generates progressive workouts: CO2 tables (fixed holds, shrinking rest) and O tables (increasing holds, fixed rest). Same methods competitive freedivers use. Free: box breathing, relaxation exercises, PB tracking. Perfect for freedivers, spearfishers, surfers, or anyone curious about breath work beyond basic meditation apps. Would love to hear from anyone into diving ... ... Think of it as your personal AI assistant that helps you eliminate 95% of manual task management . Perfect for busy professionals, remote teams, and anyone looking to boost productivity effortlessly. Excited to be part of this conversation and discover