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

A strong core doesn’t mean you have a six-pack; it means the entire network of muscles within your torso, including your lower back, hips and glutes, is robust, stable and capable of withstanding ...

Core training has always been part of military PT and fitness testing. From crunches to sit-ups, flutter kicks, leg tucks and plank poses, the U.S. military uses many exercises to test core strength.

A certified personal trainer shares 5 core moves that reveal how strong and functional your midsection really is after 50.

Read what happened when this writer swapped sit-ups and crunches for a standing ab routine ...

Editor’s note: Dana Santas, known as the “Mobility Maker,” is a certified strength and conditioning specialist and mind-body coach in professional sports, and is the author of the book “Practical ...

Experts say gait speed, grip strength, balance, and endurance are some of the strongest predictors of long-term independence. Here’s how to check them yourself—and what the results mean. Balancing on ...