A personal trainer explains how long to hold a plank for bullet-proof core strength and how to master the perfect plank form.

If you make a few adjustments, however, you can turn the modest side plank into a surprisingly tough exercise that challenges ...

This week: high planks. There comes a point in most HIIT and strength classes when the trainer will ask everyone to get down into a plank. And while there’s an argument for doing low planks ...

Keep a slow tempo throughout. You can progress the plank march by choosing a lower elevated surface, like a table or chair. Sets: 1 Reps: 30-45 seconds Come to all-fours on a mat, with hands under ...

But the standard high plank push-up isn't the only version of this popular exercise that gets results; there are plenty of push-up variations that work just as well, if not better, for ...