Knowing you’ve got an ab workout waiting for you can give anybody a case of the sweat sesh scaries. But with this three-minute routine from Holly Perkins, C.S.C.S., author of Lift to Get Lean, you can strenghten and sculpt your obliques in a mere 240 seconds.
Training your obliques is crucial because these muscles—which run diagonally from your ribs to your pelvis—not only give you amazeballs abs, but also help prevent back injuries. (And did we mention that they give you those hot “V” muscles, too?)