I could go on for days about different stretches you could do to begin contortion. Instead, here's a website with a lot of useful information including discussion forums, for beginners.
contortionistsunite.com
The man was able to twist himself like a pretzel, he was a master of contortion. or Pretzels look like a contortion
The word contortion is a noun. It is the act of contorting.
Yes, there are manga series that involve characters with contortion abilities such as "Kakegurui" and "Kuroko's Basketball." These series may feature contortion as a special skill or ability of certain characters rather than being the central focus of the story.
Demonic origin
Yes
A fantastic grimace or contortion of the body.
yes
You can begin learning contortion at virtually any age. Typicaly women have an easier time starting at later ages just because their bodies are more naturally flexible, but that doesnt mean that males can't either. I'm a male and I started training at 15, six years later im still practicing and have made monumental improvements. Good Luck :)
neck stretches maybe a neck exercise something like that neck exercise
Anna Meek has written: 'Acts of contortion'
Some effective arm stretches for flexibility include tricep stretches, bicep stretches, and shoulder stretches. These stretches can help improve range of motion and reduce the risk of injury.
Contortion/Acrobatics example/ Rod balancing, aerial silks, hoop and etc.