Tracker Technology & History

Learn how smart rings cut e-waste and carbon with less material, longer life, and better wear, plus practical steps to choose and use wearables sustainably.

Understand why finger sensors can outperform wrists on paper but falter with motion, leading to undercounted peaks in workouts. Learn when to trust a ring versus switch to a wrist tracker or chest strap, with fit, placement, and cross-check tips for dependable heart rate tracking.

Learn how and why trackers miscount steps in everyday life - and how that distorts calories, sleep, and readiness - then use simple tests, calibration, and placement tweaks to improve accuracy. Use the scenario-based guide to choose the right device or placement for your routine and budget, prioritizing outcomes per dollar and data portability.

See how accuracy - not features - has shaped the real story of fitness trackers, from pedometers to GPS and wrist-based sensors. Learn the most common real-world errors, how to assess claims with a field-tested checklist, and what advances could make measurements more trustworthy.