We bought this to work on our deep/general stretching for Taekwondo. We are starting to get more into the upper-lower belt ranges (Green to Blue). Not only does it put you into some greater stretches, it amplifies what you can already stretch to and how you stretch. It is almost like there is a level of resistance added which gives a better stretch. It feels great and you honestly get more out of stretching with the Si-Stretcher than doing the same stretches without the Si-Stretcher.