sportsclubs in santiago (Santiago de Chile)

Hi,
I wonder if any of you know can recommend a sportsclub. I don't mean a gym but more the general clubs where you can swim, play tennis, etc etc. The only one I am vaguely familiar with with is Protected content but I am looking for others. I have heard some are not open for anybody but requires some type invitation or other requirement. Any ideas about this or where I should find information. Thanks.
/Magnus