I don't mind the phrase in the context of being a strong, athletic woman.
I'm starting to love this new feeling I've developed over the past year, since I've gotten my bike actually, of being both feminine and strong. Part of me doesn't love the use of "girl" but part of me really likes it. I think it's cheeky and I like reclaiming a phrase that is often derogatory. I'm not sure I would buy something with the phrase on it, but only because I usually don't wear clothing with slogans.
"Live, more than your neighbors. Unleash yourself upon the world and go places. Go now! Giggle. Know. Laugh. And bark the the moon like the wild dog that you are!" - Jon Blais