Why is it necessary to frequently update a workout program?
A. A workout program must be updated every 4-6 weeks in order to
address different muscle groups.
B. Maintaining the same workout program will cause boredom,
making the possibility of quitting much higher.
C. A workout program must gradually be made more challenging, so
the body can continue to improve as it adjusts.
D. A workout program must be updated every 4-6 weeks in order to
address different fitness components, such as flexibility, cardio
endurance, and resistance training.