A wearable device such as a garment is disclosed, having at least one resistance element at a motion segment such as a hip or knee. The garment includes at least one sensor, for sensing a parameter. Electronics are provided for processing the sensed parameter, and for providing feedback. Feedback may be in the form of proprioceptive tactile or audible feedback, or in the form of an adjustment of a performance parameter of the wearable device. In one implementation, resistance to movement of the wearer is adjusted up or down in response to changes in power output by the wearer.