Exercises that work the core are exercising muscles found in the __________.

The correct answer focuses on the core's primary location, which is the abdomen. Core exercises are designed to strengthen the muscles in this area, which include the abdominal muscles, obliques, lower back, and pelvic floor. These muscles are crucial for stability, balance, and overall body strength.

When performing core exercises, such as planks, crunches, or Russian twists, the primary emphasis is on engaging and strengthening the muscles situated in the abdominal region. This area plays a key role in many physical activities and sports, as a strong core enhances performance and reduces the risk of injury.

The other areas mentioned, like the arms, chest, and legs, refer to different muscle groups that are not primarily associated with core strength. Arm exercises focus on the biceps and triceps, chest exercises target the pectorals, and leg workouts engage the quadriceps, hamstrings, and calves. Each of these muscle groups serves its distinct functions but does not encompass the core's role in stabilizing and supporting the body through various movements.