Ah, the plank. It may just be one of the most intimidating exercises. Anyone who has shook their way through one knows that the isometric exercise appears simple, but is anything but. To the contrary, ...

3. Cross Plank Push-Ups: Start in a forearm plank position, shoulders stacked over elbows, body in straight line from head to toe. Almost cross arms, placing right hand in front of left elbow, left ...