Which muscle group is primarily engaged during a Plank exercise?

• A. Core muscles
• B. Leg muscles
• C. Back muscles
• D. Shoulder muscles

Answer: (A)

The primary muscle group engaged during a Plank exercise is the core muscles. The core is essential for maintaining stability and balance throughout the body while holding a fixed position. During a Plank, the abdominal muscles, including the rectus abdominis, obliques, and transverse abdominis, are heavily activated to prevent the spine from sagging or arching. Additionally, the muscles of the back, such as the erector spinae, play a supportive role in maintaining an upright posture by working synergistically with the core.

While the leg muscles, such as the quadriceps and glutes, do contribute to the exercise by stabilizing the legs and supporting the body's weight, the primary focus and engagement lie within the core region. The shoulders also play a role in providing stability as they support the upper body, but again, the core remains the main area of activation. Thus, the correct choice emphasizes the importance of core strength in performing the Plank effectively.