Better Posture Exercises: Plank
Several variations of the plank exercise can help improve posture. Below is the basic plank, but a person may find different versions more or less effective.
Begin by lying on the stomach. Shift the position so that the weight of the body rests on the forearms and toes, with the rest of the body hovering above the floor. Some people prefer to have their arms outstretched and their hands, not their forearms, touching the floor.