Like many guys, I'm not great at dancing. Often a girl will try and drag me onto the dance floor if she hears a song that she likes or something. If I do try, I feel like it definitely lowers my value. But if you just say "no, I don't want to dance" or something like that when a girl asks, then you often look boring, and again it lowers value.

What's the best tactic to get out of dancing but still look like you are fun?

I'm gonna suggest you stop resisting dancing. I used to be you and I think I may have even asked this very same question, so understand that when I'm telling you that you there really isn't any way that I have ever seen or heard, that is as successful at maintaining attraction and creating more, as going along and dancing. Anything you try to get out of it will most likely end up with your value being lowered and the attraction you've worked for being reduced.

So, the key to dancing.....stop giving a fuck! Just go to the bar by yourself, or with some friends that you aren't worried will think that you doing look cool if you go and dance. If you absolutely can't get out there, get a few drinks in you and hit the dancefloor, otherwise just get on the dancefloor and stop worrying about how you look, how other people look, whether you are doing it "right" and all that bullshit. Just go out there and have fun. Have a great time dancing and then start immitating some moves that you see other people doing and soon you'll fit in perfectly fine and you'll be dancing as good as most of the people in the club.

Dancing isn't about doing things the right way, it's about feeling good and having fun. That's why she wants you to dance with her, because she just wants to stop worrying about everything going on and just lose herself in the music and the dance. The best part is that she wants to do it with you, so don't refuse, just do it. You may not dance like Usher, but if you're having fun, that's all that is going to matter and she will stay just as attracted, if not become more attracted.

I agree that dancing is all about having fun. Learn to enjoy it, listen to some club music on your own time and just dance at home, have fun, you don't need to be serious or the best ever just have a good time. Once that's out of the way mix in a bit of confidence. You've seen that guy at the club with the weirdest most ridiculous dance moves that gets all the attention, that same guy seems like a creeper is if his confidence is low. Dancing = Fun + Confidence, learn to enjoy it.

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"A bad traceur does a technique until he gets it right. A good traceur does it until he can not get it wrong"
-David Belle
"men who say it cannot be done should not interrupt men doing it"

most of the time girls dance on you!

I think most people will find they can dance better then they think if they just let themselves feel the music and stop thinking about it. Here is the trick, NO ONE IS WATCHING YOU. You aren't the center of the universe where everyone stops to see what you are doing on the dance floor.

And it's known that a woman would rather dance with a guy who doesn't dance well then stand in the corner with someone who stands like a champ.

One word of advise, don't try and invent new moves right away, just tab your feet to the beat and let your body take over.