Russian twists are a popular core exercise that targets the abdominal muscles, particularly the obliques. To perform this exercise, sit on the floor with your knees bent and feet flat. Lean back slightly while keeping your back straight, and clasp your hands together in front of you. From this position, rotate your torso to one side, then to the other, while keeping your feet off the ground for added difficulty. This twisting motion helps improve core strength and stability, making it a beneficial addition to many workout routines.