How do you perform the "Plank" exercise in Pilates?

The "Plank" exercise in Pilates is performed by maintaining a straight line from head to heels while engaging the core. This is fundamental to the exercise as it emphasizes proper alignment and stability throughout the body. During the plank, the muscles of the abdomen, back, and shoulders are all activated to support the position, promoting strength and endurance.

The engagement of the core is crucial, as it helps to prevent sagging in the lower back and ensures that the body remains in a straight line. This alignment not only enhances the effectiveness of the exercise but also minimizes the risk of injury. Additionally, maintaining this position encourages proper breathing and awareness of body mechanics, key principles in Pilates practice.

In contrast, the other options do not accurately depict the plank. Lying on your back with knees bent, standing on one leg with arms raised, or twisting the torso side to side do not engage the core in the same way or provide the fundamental benefits of the plank position. Instead, they emphasize different movements or muscle groups not central to the goal of a plank exercise in Pilates.