6-minute chair workout for belly fat after 55, trainer-led intervals that strengthen your core and support a tighter waistline.

Chair exercises for lower belly overhang after 60, with CSCS trainer Jarrod Nobbe's cues and a 5-move routine.

Crunches and sit-ups aren't the only way to build strong abs. Underrated exercises like planks and flutter kicks are effective, low-impact alternatives. Doing different core exercises also helps add ...

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.