For fat burning, the body requires oxygen to break down fat stores into usable energy, a process known as aerobic metabolism. Low-impact steady-state cardio, like incline walking (shown in the video), keeps your heart rate and breathing at a moderate level, allowing your body to efficiently use oxygen to metabolize fat. When you run, you aren’t getting a steady flow of oxygen so your body shifts to using glycogen (stored carbs) for quick energy. The body has the ability to burn these stored carb