This simple floor exercise is redefining how Americans train their core—without crunches, machines, or strain on the spine.

Stand tall and then step back with one foot, with your heel lifted. Keeping most of the weight on your front foot, bend both knees until your back knee is almost touching the floor. Your torso can ...

Side belly exercises after 45: 4 standing moves that hit the obliques and tighten your waist, from Jarrod Nobbe, MA, CSCS.