Today's ab routines are more versatile than ever. Sure, you can slog through sets of situps and rounds of planks over and over again. But, more and more, core workouts incorporate tools like Swiss ...

Why not use an ab wheel to work muscles harder during planks? It's a good way to change things up and the variation challenges balance and stability, activating muscle groups all over the body.

What is an ab roller? An ab roller, or ab wheel, is an effective and efficient way to strengthen your core and tone the abdominal muscles by rolling yourself out into a plank and back. 'The ab roller ...