"go in for" - to use or not to use, that is the question

0 Hi, 02br
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00I'm a Russian learner of English and I'm very much concerned about this expression, "to go in for (e.g. sports)" that we are taught at school and university. Some people are inserting it nearly in every sentence. It didn't sound OK for me so I tried to do a little research. 02br
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00The dictionaries, especially those made by Russians, suggest that "to go in for" is OK to use and describe its meaning just like we are taught - to take up something as a hobby, to engage in, to show interest for, etc.02br
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00However, in the Wikipedia entry about Runglish (05000) this expression is strictly denied as being particular only to Russians. But wiki is not the most credible source, so I searched the Internet for discussions of this expression, and they all gave entirely different opinions about that: some do not even understand this expression, and some say that this is OK but sounds very archaic. 02br
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00So, I just want to ask for your opinion on this:02br
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001) Are you a native English or American speaker, or smth else?02br
002) Do you understand this expression?02br
003) Do you personally use this expression, "to go in for smth"?02br
004) Do you use it only in "to go in for sports" or in other cases as well? A couple of examples maybe?02br
005) Do you find it sounding archaic? Since what time do you think it became archaic? In recent years or long ago?02br
006) Would you recommend to use it in everyday speech? In essays/compositions? Any other applications?02br
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00Thanks. I need as much opinions as possible 0510240hrefhttp://en.wikipedia.org/wiki/Runglish11id1