Look into the faces of people who float somewhere in Antarctica in freezing water among glaciers. They are full of happiness. No other luxury hotels and clothes can substitute those feelings. Nothing will substitute the feelings when you swim up to the shore and you are the first person that steps on the land. Can anything substitute the feelings when you are skiing in a virgin snow and you cause small avalanche. What can be better of headwind when you are riding a bicycle in the mountains? These and many other feelings you can experience from extreme sports.