You're going to want to add planks to your routine after reading this one.

Add Yahoo as a preferred source to see more of our stories on Google. It’s normal to struggle to do a plank. Many of my clients need to begin with a modified plank, and if you’re new to fitness, ...

YOU PROBABLY THINK you know how to do a plank. The ab training staple is relatively simple, after all—boiled down to the basics, all you need to do is get down on the ground and hold in place.

A certified trainer shares how long you need to hold a plank to signal elite core strength after 60 and what your time means.

For years, fitness enthusiasts chased the elusive two-minute plank, believing a longer hold signaled a stronger midsection.

You’ve seen those viral social media challenges. Someone holding a plank for what seems like an eternity, face contorted in agony, body trembling, all while the clock ticks mercilessly onward. Maybe ...