No! Benefits start at a mild angle of 20 degrees. To fully decompress the spine, work up to 60 degrees (the angle of the rear legs). The Angle Tether allows the user to easily pre-set the angle of inversion so you never go farther than you want. It’s interesting to note, however, that over half of all Teeter customers do routinely fully invert (“lock-out” at 90 degrees) because they like the way it feels and enjoy the added freedom of movement for stretching and exercise.