Mastering Efficient Arm Swing by Limiting Elbow Angle ■ By semi-fixing the arms at around 90 degrees and swinging them forward and backward with the image of a pendulum motion centered on the shoulders, this helps to create a smooth and rhythmic arm swing and pelvic twist. ■ When pulling the arms back, the key is to be able to move the shoulder blades. ■ Suitable height: 145cm - 185cm Contents: Set of 2 main units Purchased around 2024, used only a few times by a child. Instruction manual is not included. Please refer to the Nishi website or YouTube for usage instructions.