Control and concentration are two other very important principles of the Pilates method and are obtained by SLOWLY carrying out the movements. Slowness and precision form the foundation of the practice.
For further information: The posture in Pilates
Because it is important
Constant control is what allows you to perform the required exercises correctly, paying attention to the body with every movement and breath.
"The most important thing is not what you are doing, but how you do it" J.Pilates
For further information: Breathing in Pilates