The DEX • decompression & extension provides all of the benefits of inversion while holding the user in the 90/90 position, which is the optimum position for decompression of the lower back. From this position, the user is in a body position relevant to gravity that maximizes muscle performance during back extensions while helping to prevent hyperextension.
Improving upon the traditional roman chair, the unique design actually reduces the load on the hamstrings by placing the knees in the relaxed 90° position, rather than forcing less effective, straight-legged exercises.