Do you have a name for the activity, going down on a cliff with a roap on your body? This activity seems to be a sport, an extreme sport.

Answer 1

I think you mean rappelling.

https://www.google.com/search?q=rappelling&spell=1&sa=X&ved=0ahUKEwiZ3rOE_ungAhVEQq0KHVKPDyEQBQgpKAA&biw=1250&bih=618