One easy way to immediately switch things up is to stand up. Standing ab workouts normally involve more of a full-body workout than lying down, as you have to engage your leg muscles and glutes to ...

Forget sit-ups — use this 10-minute standing abs workout to build a strong core Start by shifting yourself forward in the chair, so you are on the edge of the seat with both feet flat on the floor.

“I recommend sets of 6 to 10 reps since these are pretty hard. If you’re struggling, do them from your knees and only go down ...