So hold up...I know this may sound weird as hell, but here goes:
So my sister has a mad crush on this guy at the gym and is too chicken to approach him. The thing is, she already has a boyfriend who isnt too great of a guy. She really wants to meet this guy at the gym, who is a weather man, so im thinking why not be her wing and help the poor girl out?? How do i go about being my sisters "wing"?

You should go up to the guy and start talking to him. Become a friend with
him but not too good of a friend because you might find out that he is not
worthy for your sister either.

If you go to the gym with her, just go to some weights that are close to him
and strike up a conversation about something in the gym, maybe like how
the weights are different from the other gym that you used to go to or something.

Be sure to let him know that you are not gay, but are just looking to make
more friends because one can never have too many friends.

Then after talking to him, you can say, "Man, that girl over there is cute..
(YOUR SISTER)... what do you think?"

And then you can see if he even finds her attractive AT ALL...

Just act like another guy talking to another guy about a girl...and you should
find out if he is a player, or if he is a decent guy... well, decent enough to
date your sister that is...

Don't tell him that you are related to her, don't give off that vibe either.

When you two get to the gym, and he is there, don't walk in together...

Just tell her that you are going to go and talk to him to see if he is worthy
of her (aww she loves her brother, looking out for her)... anyways...

Do you get the whole concept of this idea bro??? Good luck.

_________________
| NLP eBooks etc | SEDUCTION eBooks etc |
| Sexual Decoder System (Yes, that one) **PDFs / Videos** |
I have reviewed A LOT of PUA books, videos, etc. I only upload the ones that have the best information.

Thanks for the input man, everything helps. Only problem is... We have gone to a few classes and partnered up. Im pretty sure he knows were siblings, after all, our mom is an instructor at the gym and so is he (on some days)

Wow. This just threw a monkey wrench into the gears...

I actually have nothing to respond to with this...

CALLING FORTH ALL MY OTHER PUAF PALS...

_________________
| NLP eBooks etc | SEDUCTION eBooks etc |
| Sexual Decoder System (Yes, that one) **PDFs / Videos** |
I have reviewed A LOT of PUA books, videos, etc. I only upload the ones that have the best information.

This doesn't seem too hard. If you've got guys who wing for you, ask one of them (one you trust a lot) to wing for her, using the method that Leprechaun described above. That might even be a better idea to begin with, since if you pretend you don't know her and then they become an item, he's bound to get proof positive that you're siblings and then he's going to wonder why you pretended you didn't know her.

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Some vices miss what is right because they are deficient, others because they are excessive, in feelings or in actions, while virtue finds and chooses the mean.
Aristotle, Ethica Nichomachea