Low-Intensity Steady State cardio – short LISS – stands for any type of cardio exercise where you maintain the same low-intensity cardio pace (steady state) for a given period of time. Walking on the treadmill or outside whilst maintaining a steady state for 35 minutes is one form of LISS training, another one could be steady cycling either on a spin-cycle bike or outdoors, steady rowing or using cardio equipment at the gym, for example the elliptical trainer at a steady and moderate pace.