Final answer:
Good core strength is essential for performing the GHD exercise as it requires stability, control, and engagement of the core muscles.
Step-by-step explanation:
Good core strength is essential for performing the GHD exercise. The GHD, or Glute-Ham Developer, requires core strength to maintain stability and control during the movement. When performing the GHD exercise, the core muscles, including the muscles of the abdominal wall and the vertebral column, are engaged to extend and stabilize the body's trunk. Having a strong core helps prevent back strain and allows for proper form and execution of the GHD exercise.