Which of the following is NOT one of the key principles of Pilates?

The key principles of Pilates focus on building a strong mind-body connection to enhance physical strength, flexibility, and coordination. Among these principles, concentration, control, and breathing play fundamental roles in the practice.

Concentration emphasizes the importance of mindfulness and intention during each exercise, ensuring that the practitioner is fully engaged with the movements. Control is about executing exercises with precision, which is essential for optimizing effectiveness and minimizing the risk of injury. Breathing is integral to Pilates, as it helps in coordinating movement, maintaining focus, and promoting relaxation.

In contrast, cardio is not considered one of the foundational principles of Pilates. While incorporating elements of cardiovascular fitness can be beneficial, Pilates primarily focuses on strength, stability, and alignment rather than aerobic conditioning. Thus, the correct answer reflects the difference between core Pilates principles and aspects that do not fundamentally define the method.