A sport, not considered extreme, can be defined thus if it is practiced under special conditions or particular circumstances not habitual in him. For example, rock climbing a few inches off the ground (bulder) is not considered "extreme sport", but if it is performed on a rocky vertical wall several hundred meters high, then the term is applied.
A person can be considered to practice an "extreme sport" when he does it for the first time. For example, class IV rafting is quite extreme for those who have never before boarded a raft and will feel it well beyond their personal capabilities.
