A CSCS trainer shares 4 bed core exercises after 60 — master these moves and your core will rival someone a full decade ...

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.

If you’ve been a regular reader of Master Class over the years, you’re familiar with my affinity for core training as a method of strengthening “from the inside out.” Core training is an umbrella term ...