This is adult swaddling
Better known as "otonamaki"
Which literally translate to adult wrapping or in my country this called "binalot sa tila" a form of stress therapy.
The practice originates in Japan
and believed to be incredibly therapeutic.
The cloth meant to emulate a mothers womb.
Adult swaddling is believed to reduces stress , improved posture, and get rid of back pain.
Practitioners say the swaddling relieve stress and make them more flexible.
Would you try?