$134
Activity Tracking
Fitbit Charge 6
Google-built health, on a slim band.
A slim fitness tracker with built-in GPS, 40+ exercise modes, heart-rate, sleep and stress tracking, plus Google Maps, YouTube Music, and Google Wallet integration.
Scientific Rationale
Accessible continuous tracking democratizes biometric awareness; built-in GPS enables accurate outdoor exertion metrics without a phone.
Daily Protocol
Track every workout. Review nightly sleep score and stress response trends weekly.