1 definition by Cohen, Baluch and Duffy 2018
A predominantly competitive (comparison or self-evaluative) activity within which the participant is subjected to natural or unusual physical demands. Moreover, an unsuccessful outcome is likely to result in the injury or fatality of the participant, in contrast to non-extreme sport. -Cohen, Baluch and Duffy
by Cohen, Baluch and Duffy 2018 October 31, 2018