Hold the backrest upward and pull the yellow handle outward to adjust the angle up and down. If you don't support the weight of the backrest, it will get stuck in the handle, and of course you can't pull it. Don't be shy about fitness. Ask if you don't understand. Everyone is from Xiaobai. Including the correct movements of fitness, the use of equipment and diet, you can communicate with the big coffee in the gym. Fitness people have a problem, that is, they are particularly willing to share their knowledge, which is endless.