Deep inside Earth, researchers see signs that the solid inner core may be arranged in multiple chemical layers far below.

Try these 6 joint-friendly standing moves to fire up your core, raise your heart rate, and help trim belly fat after 50.

Build a stronger, leaner core after 50 with 6 standing workouts that tighten your waist, improve posture, and boost strength.

Build stronger core in 8 minutes with a bodyweight routine that beats long gym workouts and supports posture and balance ...