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Witam,
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There are other arguments that are standing for extreme sports. Extreme sports can be lots of fun and give the opportunity to feel the adrenaline, that is very important in people lives. For example jumping from an airplane can give you a good sensation and be a one-life-chance to feel like a real bird. In this example somebody can overcome his fears instead of having a good time in the air. Those situations take place also in other disciplines.
That was the bright side of extreme sports, but like in every life aspect, there is a dark side, that everyone wants to forget about.
Extreme sports can bring tears and pain. For example, when it comes to motorcycling, there are times when the solid equipment and superior abilities aren`t enough or can be instead an obstacle for the biker. Nowadays there are bikers that want feel the adrenaline whatever it takes, but compared to the price, that they must often pay, it’s only a childish dream, that can ruin many lives...
In those sport disciplines there also many injuries. For example - american football. It’s a very popular extreme sport in America. It’s a brutal game where the players must score a touchdown whatever it takes. Many players must end they career, because of the injuries, that they receive when they tackle or are overrun while running with the ball.
In my opinion extreme sports are very good for the mankind. They can help: change somebody’s lifestyle, overcome a fear, fulfill wishes or feel “a real life”.

There are other arguments 'that are standing' (tego nawet nie rozumien i nie wiem co to zdanie tutaj robi) for extreme sports.
Extreme sports can be lots of fun and give 'the' (zle slowo, daj to poprawne) opportunity to feel the adrenaline, that is 'very important' (a niby od kiedy, sa ludzie dla ktorych 'adrenalina' nie jest potrzebna,) in people lives.
In this example somebody can overcome his fears (a niby jakie one byly? te, ze boje sie slimakow, pajakow? musisz napisac) 'instead of' (cos tu nie tak) having a good time in the air.
That was the 'bright' (zle slowo, bo przeciez niema 'dull side' czegos) side of extreme sports, but like in every 'life aspect' (aspect of life), there is a 'dark' (ale 'dark' nie jest 'opposite do 'bright' - popraw) side, that everyone wants to forget about.
For example, when it comes to motorcycling, there are times when the solid equipment and superior abilities 'aren`t' (nie uzywaj tego dziwactwa - napisz to w calosci) enough or can 'be instead' (zla kol slow) an obstacle for the biker.
In those sport disciplines there (tu cos brakuje) also many injuries.
...For example - american football....(a czay to jest zdanie, i American -duza litera)
Many players must end 'they' (zle slowo-popraw) career, because of the injuries,
that they receive when they tackle or are overrun while running with
the ball.
In my opinion extreme sports are very good for 'the mankind' (czy to ma znaczyc 'dla wszystkich' - bzdury). They can help: change somebody's lifestyle, overcome a fear, fulfill wishes or feel '“a real life".' (tego nie rozumiem, jakie 'real life'?)