Final answer:
The AFAA recommends incorporating warming up within the warm-up portion of the class to prevent injuries.
Step-by-step explanation:
According to the AFAA (Aerobics and Fitness Association of America), it is recommended to incorporate warming up within the warm-up portion of the class to prevent injuries. Warming up before an intense activity helps prepare the body for exercise and increases blood flow to the muscles. It typically involves performing light cardiovascular exercises, such as jogging or jumping jacks, and dynamic stretches that mimic the movements of the main activity.