Correct Response: C. The body's core consists of several muscles that surround the lower spine and pelvis and includes the abdominal muscles. Strength and flexibility in these muscles help provide stability and maintain alignment throughout the body. One benefit of performing core flexibility and strength-training exercises is a reduced risk of lower back problems. These exercises are not directly tied to a reduced risk of glandular disorders (A). Circulatory (B) and respiratory (D) functioning are more likely to be improved by aerobic exercises rather than core flexibility and strength-training exercises.