Many theories exist regarding what happens in the afterlife. However, a few, who've skimmed the thin line between life and ...

Even at rest, the muscles of the heart work hard—twice as hard as the leg muscles of a person sprinting. Feel your pulse by placing two fingers at pulse points on your neck or wrists.

Indicates whether the model employs a chest strap mounted sensor that transmitts to a watch, a chest strap mounted sensor that transmits to an iPhone app, a watch that requires the user to touch ...