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I'd put it this way:

1. I like girls.
2. I like girls very much.
3. I like beautiful girls.
4. I like beautiful girls very much.
5. I like extremely beautiful girls.
and so on and so...

Do you mean: I work out at the gym three times a week because I like it. If so, I'd translate it as follows:
Я хожу в тренажёрный зал три раза в неделю, потому что мне это нравится.