The tower is a vertical, space-saving, version of the largest Pilates apparatus "the Cadillac". It uses a variety of attachments including a roll-down bar, arm springs, leg springs, and a pull-through (or push-through) bar to provide a full body workout.
The tower offers another dimension to the Pilates workout. Exercises on it are typically performed more slowly and with more control making it a great option for beginners. Additionally, movements often focus on one body part at a time, making it easier to work one set of muscles in a rehabilitation situation. In short, the tower is great for beginners, physical therapy or advanced practitioners as it offers exercises that range from beginner level to advanced.