Describe the "Scissors" exercise on the reformer.

The "Scissors" exercise on the reformer is specifically designed to engage and strengthen the hip flexors and abdominal muscles while emphasizing controlled leg movements. In this exercise, practitioners lie on their backs with legs extended and perform a scissor-like movement as they alternate lifting and lowering their legs. This action not only activates the core, fostering stability and strength in the abdominal region, but also effectively targets the hip flexors as they work to control the movement of the legs.

The emphasis on control is vital; it allows for better muscle engagement and contributes to the development of coordination and balance. By maintaining a stable pelvis while the legs move, participants can enhance their awareness of core engagement, which is a foundational principle of Pilates. Thus, the correct answer highlights the primary focus of the "Scissors" exercise, which is the target on these specific muscle groups through meticulous movement control.