Consumer wearables have become everyday tools for monitoring sleep and physical activity. Researchers at the Centre for Sleep ...

If an ape index sounds like a measure of how good you might be at swinging through trees, you're not far off. Climbers can benefit from knowing this metric.

Ghost Murmur was described as a futuristic CIA tool that could detect a heartbeat from vast distances. Physicists say the ...

Master the two simple scales that pro lifters use to measure intensity, avoid plateaus, and ensure every set counts.

Here's how Oura, Whoop, Garmin, Apple Watch, and Fitbit all calculated last night's "sleep score." ...

Some fitness trackers may detect signs of heart disease, sleep problems, and chronic stress. However, there are limitations and risks to consider.