The extreme sport  is a popular term for certain activities perceived as having a high level of inherent relative danger, These activities often involved: speed, force, height a high level or physical exertion. I think these sports are for lovers adrenaline or people that looking for challengers. Other persons thinks it is really dangerous. We can said, we have two
kinds;risks minimum and maximum. For example parkour; when you watch this sport you think there is easy but you need skill for practice; and it is easy hurt yourself.If you practice climb "solo" if you have a mistake you should be die. I tried the bungee jump, the experience was  really awesome. In conclusion is bad or good?; it is depends the persons.