Louise DrakeHow To Do A Perfect Plank - Benefits And Form Tips, According To A TrainerWomen's Health - Jennifer NiedYour guide to mastering the abs exercise. Staying still is hard work. Try holding a complex yoga pose or bracing through a plank, and tell me I'm wrong. You can really feel the burn without moving a muscle. Planks, which work muscles from your shoulders all the way to your legs, are a true rockstar …