As yoga teachers, it is our job to assist people in moving their body in mindful ways that will bring overall physical and mental well-being. A big part of this responsibility entails preventing injury whenever possible. To this aim, yoga teachers use a myriad of alignment cues designed to protect the body from injury. Some of these cues are good advice. Others seem to make little sense. For example, why should one flex the ankle to protect the knee in a hip opening pose? In order to understand whether this is a useful alignment cue, we must explore the effect that hip opening poses have on the knee, and how movement at the ankle may or may not mediate this effect.