Final answer:
The workout described is an example of the Specificity principle in exercise.
Step-by-step explanation:
The workout described, involving push-ups, running, and lifting a heavy barbell, would be considered an example of the Specificity principle.
The Specificity principle states that to improve a particular fitness component or skill, one must perform exercises that target that specific component or skill. In this case, the workout focuses on developing upper body strength, cardiovascular endurance, and strength in the lower body.
This workout does not necessarily align with the other principles mentioned. The Overload principle refers to gradually increasing the intensity or difficulty of an exercise over time. The Progression principle suggests gradually increasing the volume or frequency of an exercise to improve fitness. The Reversibility principle states that if a person stops exercising, the benefits gained from working out will decrease or be lost entirely.