Extreme Sports

As for me, extreme sports enable us to release some built-up adrenaline. It is possible to get addicted to such a lifestyle. People look for more experience to be more endure.  (Not sure what you mean here?) Such These kinds of sports are addictive because of the happiness which appears in a human's mind during physical activities. One can feel unlimited and able to reach anything.
Secondly, this these kinds of sports increases our endurance, both psychological and physical. People are born without any mental content. That means we build our strength by a variety of decisions, problems and finally experience. People who always take challenges have more a better abilities to stay calm and keep clear mind a cool head during some extreme situations.
On the other hand, such sports undoubtedly may cause injuries. Training takes lots of hours of practise and willpower. Not everybody is able to endure this but the reward is priceless. Despite this, people doing extreme sports may even lost lose their life.
To sum up, sports cause people's lofe lives to be healthier but extreme sports are undoubtedly ways of testing our abilities and physical or psychological endurance. In addition, organising events which gathered lovers of extreme sports can increase our awareness of it.

Hey Aleksandra! This is really well written! I should just mention that some things seem a little "artificial" or "foreign." For example, while "such" is used correctly, it's more common to use a phrase with "like" or "type" or something. Where you write "It is possible to get addicted to such a lifestyle," I would probably say "It's possible to get addicted to this kind/sort/type of lifestyle." Of course, more official writing often uses the kinds of phrases you have, so this would all be fine in a document of some sort - just depends on what kind of writing you're trying to produce.

Anyway, keep it up!