Fitness & Health Gear
Smartwatches, heart-rate monitors, sleep rings, and fitness trackers evaluated by sensor accuracy, metrics, and actionable value.
Learn the internal engineering of tri-axial accelerometers. Why smartwatches count arm gestures as steps, pocket trackers vs. wrist, and the 8,000-step sweet spot.
Explore the technology behind heart rate monitoring. Electrocardiography (ECG) chest straps vs. photoplethysmography (PPG) wrist sensors in high-intensity training.
Compare smart rings vs. smartwatches for sleep tracking. Finger arteriolar photoplethysmography (PPG) vs. wrist sensors, battery life, and comfort.
