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Reebok has come up with a new campaign, ‘your move’. It is very interesting to see that its brand positioning is very different, indeed contradictory to its competitors, Nike and Adidas. its competitors are positioning their brands as a pristine attitude, a pinnacle of achievement and success. But Reebok wants to be more individualistic and wants to encourage people to give their best in whatever they do, to run for themselves.
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Reebok has come up with a new campaign, ‘your move’. It is very interesting to see that its brand positioning is very different, indeed contradictory to its competitors, Nike and Adidas. its competitors are positioning their brands as a pristine attitude, a pinnacle of achievement and success. But Reebok wants to be more individualistic and wants to encourage people to give their best in whatever they do, to run for themselves.

You're pretty close here. Rather than positioning their brands, I think they are branding their products. I don't think "pristine" is the word you want.

You started wtih a "But" and that's fine, but realize that it immediately makes the writing less formal. Double check the capitalization of "your move." Is it really lower case?
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indeed opposite to that of its competitors, Nike and Adidas
Also, there's a lot to change in:
its competitors are positioning their brands as a pristine attitude, a pinnacle of achievement and success. But Reebok wants to be more individualistic
Not clear enough, not running similar/parallel concepts (achievement/success vs individualistic). This is just words getting ahead of real thinking.
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can you please help me to rephrase that line
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