Lately, my core routine has felt staler than week-old sourdough bread. Sure, classic moves like crunches, Russian twists, and planks are great (and effective!), but in order to reap the gains of ...

Exercises like push-ups, crunches, planks and Russian twists involve the hands, forearms, buttocks or the back touching the ground. But what if you don't want to sit or lie down or use your hands to ...