Similar to HIIT, metabolic conditioning is often used to refer to high-intensity exercise performed to the point of being out of breath or experiencing muscle soreness. Here is why this overused term ought to be retired from the lexicon: Metabolism is the chemical process by which a biological organism produces energy for muscular contraction. That means that any exercise requiring a muscle contraction (which in itself requires energy) is a form of metabolic conditioning. Standing from your chair after reading this post requires your metabolism to fuel your muscles. Therefore, it is more appropriate to describe the level of effort required to perform the planned activity, such as low-intensity, moderate-intensity, high-intensity or maximal intensity.