Answer:
A. fitness fad
Step-by-step explanation:
An aerobic exercise refers to all forms of physical activity that an individual engages in, in order to increase the heart rate (from low to high intensity) in response to the level of oxygen required by any activated or working muscle in the human body. Some examples of aerobic exercise (cardiofitness activity) includes cycling, swimming, jogging, walking, skiing etc.
In this scenario, Michael had the believe that a piece of equipment he bought will quickly sculpt his abdominal muscles. Thus, this belief can best identified as a fitness fad.
A fitness fad is an intense enthusiasm on a fitness equipment irrespective of its quality. Thus, a fitness fad is a widely shared and shortly-lived sentiment among end users with respect to a fitness equipment without considering its qualities.