What should always be maintained during an exercise on the reformer?

Maintaining proper alignment and engagement of the core muscles during an exercise on the reformer is essential for several reasons. First, proper alignment ensures that the body is positioned correctly, which reduces the risk of injury and allows for optimal movement patterns. When the body is aligned, each part can work effectively and efficiently without unnecessary strain.

Engaging the core muscles is equally important as the core acts as the body's stabilizer. A strong and engaged core supports the spine and pelvis, allowing for better control during movements. This foundational strength enhances overall stability and balance, which are crucial for performing exercises safely and effectively on the reformer.

While a high level of cardio endurance, full range of motion in all joints, and rapid transitions between movements can enhance certain aspects of fitness, they are not as fundamental to the safe and effective practice of Pilates as maintaining proper alignment and core engagement. Therefore, focusing on these aspects ensures a solid foundation for the practice and helps prevent injury during workouts.