When Engaging in Physical Exercise, It Is Important to Remember

When engaging in physical exercise, it is important to remember that:

A) people who revitalize their bodies are more likely to worry.
B) strenuous physical activity causes people to become upset over events and problems.
C) a person's muscles and circulatory system are not designed for a life of activity.
D) the exercise should be vigorous to the point of inducing perspiration.