From Thanksgiving feasts to daily workouts, here's how the AI-powered coach in the Fitbit app kept me on track and actually made exercise enjoyable.

Figuring out who to screen could change the game. This discovery is getting us closer.

Waking up with stiff joints and tight muscles becomes increasingly common as we age. Our joints and muscles can stiffen more while we sleep, and as we age our neuromuscular coordination slows down.