Let’s be honest: you’ve probably done thousands of sit-ups thinking they’d give you a stronger core. We all have. But here’s the uncomfortable truth—those endless crunches aren’t doing much for you.

In the mid-1990s scientists found evidence that Earth’s inner core, a superheated ball of iron slightly smaller than the moon, was spinning at its own pace, just a bit faster than the rest of the ...

(CNN) — If you’re like most people, when you hear the word core, you probably think of six-pack abs. But your core is so much more than that — it’s the powerhouse that stabilizes, supports and moves ...