To put it simply, the plank is one of the best exercises you can do for core conditioning. Not only does it strengthen your core, but it’s also a bodyweight exercise. Planks are fairly similar to being stuck in a push-up position, but without moving your body up and down.To do a standard plank (high plank), simply get into a push-up position with your hands and toes on the floor, hold it for at least 30 seconds. You should feel your muscles working and your core tightening.