During which part of the class do tread blocks generally appear?

Tread blocks typically appear mid to late in the class because this timing allows participants to gradually build up their intensity and stamina as the workout progresses. The structure of an Orangetheory Fitness class involves a warm-up period, followed by increasing intensity as the blocks are introduced. Placing the tread blocks in the middle to later stages ensures that participants have adequately warmed up, are ready to push themselves, and can maximize the effectiveness of their workout. This approach helps to appropriately manage energy levels and enhances overall performance, making it more conducive to achieving heart rate goals and optimizing the benefits of the session.