The exercise known for improving core strength and stability is plank training. Planks engage multiple muscle groups simultaneously, particularly the abdominal and lower back muscles. This isometric exercise helps develop overall core stability, which is crucial for maintaining good posture and preventing back injuries. Moreover, the plank can be modified to target different muscle areas, increasing its versatility and effectiveness as a core-strengthening exercise. Regular practice can lead to improvements in balance, athletic performance, and functional movements.