Gravity boots and pull up hooks are very useful for exercises, especially back exercises on pull day and triceps. The boots are useful for abdominal exercises and back stretching exercises to increase your height. Medically, they are very beneficial in increasing height, but do not exceed the required duration. Clean use and they are clear in the pictures. I'm not asking for much for them, and their price is shown in the pictures + negotiable and I can be considerate.