Are you ready for abs strong enough to stop bullets? For a core to rival that of Marvel superheroes? For a six pack with more definition than an ice cube tray? Then we challenge you to complete this Ultimate Fat-Sizzling Intense Ab workout! This intense ab workout is meant to raise your heart rate as it helps you build strong, lean muscle. Plank variations to get flatter abs and a stronger core. ... Change up your core workout with these fresh variations on the plank. ~ Berceste