1. Find the height adjuster, which is usually located at the head or bottom of the equipment.

2. Adjust the height adjuster to an appropriate height according to your height. If you are tall, you may need to adjust the height adjuster to a higher position, so that you won't feel uncomfortable when doing sit-ups. If you are short, you can adjust the height adjuster to a lower position, so that you can use the equipment more conveniently.

The third step is testing. Before using the supine board, test whether the height is appropriate. You can sit on it first, and then try some simple sit-ups to see if the height is comfortable and suitable for your body. If you feel uncomfortable, please readjust the height.

It should be noted that the appropriate height can make you exercise better, but it needs careful adjustment and testing. You can adjust it according to your height and feeling to achieve the best effect.