Functions
3 adjustable height
Level 1 – to provide the minimum amount of stretch for beginners, ground clearance is 2 3/​​4 inches (7 cm)
Level 2 – provides greater stretch for advanced users, ground clearance is 3 1/2 inches (9 cm)
Level 3 – providing maximum stretch for advanced users, ground clearance is 4 1/4 inches (10.8 cm)
Backplane have a middle slot , it can stabilized the spine when stretching waist
Belts can be used to fixed the device on a chair or car seat