In the early days can not sit all day on it. But after a few weeks do not want to miss this one. You can tell it's actually hardly that of the lower back all the time working and always be balanced. During the break I put my pillow on the ground and put myself on it to work with the whole body. Or lifting the meantime while I sit on it because then the legs to the abdomen is also working with. I'm just saying "multifunctional"
