Extreme sports are about exhilaration, skill and danger. They do not normally involve teams and there are very few rules. People who take part use their skills and experience to control the risks. That control is what makes them sports and not just dangerous behaviour. Coasteering: this is exploring the coastline without worrying about a coastal path or finding a rocky cliffy cove blocking your route. You climb, dive, swim and clamber from A to B. There are about 15 operators in the UK offering coasteering.