Final answer:
Fred's inertia will remain the same as his mass remains unchanged.
Step-by-step explanation:
Fred's practice of spending most Sunday afternoons at rest on the sofa, watching pro football games and consuming large quantities of food will not have any effect on his inertia. Inertia is the resistance of an object to change its state of motion. It depends on the mass of the object. In this case, Fred's mass remains the same regardless of his activities on Sundays, so his inertia will remain unchanged.
Learn more about Effect of activities on inertia