Which of the following is NOT a type of Pilates equipment?

The treadmill is not a type of Pilates equipment, while the other options are integral to Pilates practice. The reformer is perhaps the most recognized piece of Pilates equipment, utilizing springs and pulleys to assist or resist movement, allowing for a wide variety of exercises. The Cadillac, also known as a trapeze table, incorporates a bed-like structure with vertical and horizontal bars, helping practitioners perform exercises that require more assistance or support. The Wunda chair is a compact piece designed for strength and functional movement training, emphasizing core stability. Each of these pieces of equipment is designed specifically to enhance the principles of Pilates, focusing on core strength, flexibility, and overall body alignment, which distinguishes them from a treadmill, which is primarily used for cardiovascular exercise rather than the core-focused methodologies of Pilates.