Plank

The plank is one of the best exercises you can do for your core because it builds isometric strength to help sculpt your waistline and improve your posture.Place the forearms on the ground with the elbows aligned below the shoulders, and arms parallel to the body at about shoulder-width distance. If flat palms bother your wrists, clasp your hands together.A fit, healthy guy should be able to do a two-minute plank.