Baby swaddling is an age-old tradition but now the practice has spilled over to adults.
Adult swaddling or wrapping is the latest craze to take hold in Japan.
The treatment involves wrapping a person up in cloth in a bid to improve flexibility.
Called Otona Maki, the practice was invented by Japanese midwife Nobuko Watanabe.
Japan has been swept by a new craze called adult swaddling
Once a person is wrapped up tightly in their cloth, they are rocked gently from side to side.
The movement aims to loosen up muscles and bones and is most popular with new mums.
According to its inventor, adult wrapping can help women who suffer from post-natal stiffness in their shoulders or hips.
Nobuko said: “We call baby swaddling in Japan ‘doll wrap’.
Japan: Adult swaddling involves wrapping people up in cloth and rocking them
We understood why babies sleep well like this and when adults tried it, it helped loosen them up
“We wrap them in cloths and they sleep very well like that. I believe this came about when someone thought about doing this with adults.
“We understood why babies sleep well like this. And when adults tried it, it helped loosen them up.
“We think it would be good to add this before exercises and also after birth – many new mothers have hip aches and shoulder aches – so we wrap mothers for this.”
Patients are tied up for about 20 minutes each session, to allow time for their flexibility to improve.
Japan has introduced the unusual adult swaddling method for new mums to improve flexibility
Cameras have captured an Otona Maki workshop in Tokyo, which costs 3240 yen (£23).
The practice of swaddling is no stranger to controversy.
Baby swaddling was all but eradicated in the 1980s because of possible health problems it caused in infants.