This is another great anti-rotation exercise on the TRX. The key here is that your hip stay stable as if a glass of beer is sitting on your low back.... don't spill the beer! Allow the TRX rest the shoulder of the stabilizing arm (unless you are looking to create more of a demand for shoulder stability. If so, proceed with caution as it is very unstable). You can make it more challenging by coming further under the anchor point or by changing the width of your feet. The closer your feet are together the harder it is. But remember... don't spill the beer.