Yes, it's helpful to hang the horizontal bar, because it's a stretching exercise, which is conducive to growing taller.

Physical exercise conducive to height growth: mainly jumping-basketball, volleyball and other sports with jumping movements are very helpful for height growth, and you can also practice touching heights more at ordinary times. Stretching-find some increased exercise to practice and stretch your body. It is also good to practice single parallel bars, mainly by hanging your body in the air, so that your body can grow taller under the action of gravity. Other sports, including jumping and stretching, can be tried. Practice every morning and evening, and stick to it for a while and you will see the effect.