Plank walk with dumbbell drag

This week’s exercise is courtesy of sandbag-training expert Josh Henkin and Men’s Health adviser Rachel Cosgrove, creator of the Men’s Health Spartacus Workout Series (our legendary fat-blasting boot camp). The plank walkup with dumbbell drag is a new—and much harder!—version of the classic plank.

What makes it so novel and, more importantly, so effective? While in a plank position, it requires you to drag a dumbbell from one side of your body to another. “The plank exercise is about keeping your core perfectly stable,” says Cosgrove. “Adding the dumbbell drag means that you have to still maintain core stability while you move a load back and forth, making it an extremely challenging version of the plank.” (To make it even harder, you can use a sandbag instead of a dumbbell.)