Planks are a type of exercise that involve maintaining a specific position to strengthen the core muscles. The most common form of plank is the forearm plank, where the bodys weight is borne on the forearms, elbows, and toes. There are also variations such as the side plank and the reverse plank. Planks are commonly practiced in Pilates and yoga, and are used in training for sports like boxing. The exercise strengthens the abdominals, back, and shoulders, and also engages other muscles such as the trapezius, rhomboids, latissimus dorsi, pectorals, and deltoids. Planks are known for their ability to improve core strength and endurance, which is important for daily activities and can help reduce lower back pain. There are different types of planks that may have slightly different benefits, and many variations are suitable for both beginners and advanced exercisers).