Sex swing for your health! Naw, it's not a sex swing. I mean not officially. What you use it for is entirely up to you though. What Sit & Decompress developed their dangling doorway harness for is your spine. They call it the Ultimate Back Stretcher.
The Sit and Decompress system works in tandem with a doorway pull-up bar (sold separately). The harness loops over the bar's narrow, protruding front posts, and then velcros and buckles around the chest / upper ribs of he who desires spinal decompression and a 20% to 25% increase in disc space.
Sit and Decompress is intended to relieve pain for those with "virtually all" low back injuries and conditions, including sciatica, scoliosis, degenerative disc disease, bulging or herniated discs, an uneven pelvis, arthritis, and spinal stenosis. Chillin' in the harness for around 5 minutes a day can also help improve your back's range of motion and decrease stiffness.
So too might Sit and Decompress make honest men out of dudes who are 5'11" but habitually tell people and dating profiles that they're 6'0".