Adjust the rings to a height that allows you to lean back with your feet forward. Keep your body in a straight plank position throughout the movement. Start with your arms fully extended and your palms facing upward. The key to this exercise is keeping your elbows high and fixed in space. Curl your hands toward your forehead by bending at the elbows, ensuring your upper arms do not drop. Squeeze your biceps at the top and slowly lower yourself back to the starting position with control.