Its all about style, if you can do one better than the other, it looks better, most people cork out their spins way easier than bio. I find cork is WAAAAAY more natural occuring, so I think its easier , but also more stylish for me. Since I cant bio, me trying to do one and landing on my face wouldnt be so sweet.
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Good friends tell you about the time they nailed that broad....BEST friends reach over, tag your hand, and say 'YOUR TURN'