A plank is the position of your body when it is aligned in a straight line, just like planks of wood. Would you know the common plank mistake we do on planking? Planks are a great way to bring in many health benefits for your body. This workout offers posture improvement, a healthy back, reduced belly fat, core strength, improved flexibility, metabolism, and overall mental health. This exercise form is fun and doesn't require a lot many minutes of your day.