Darkmind, you are right that humans do not have the type IIb like animals do, but Type IIb and type IIx are very similar for the purpose of our discussion.
Be careful not to overemphasize the role genetics play. Think of genetics as a limitation at the elite level. If you have a high amount of type I fibers, you are not going to be able to be a elite level sprinter, powerlifter, or running back. Vice versa, if you have a high number of type II fibers (lucky you) you aren't going to be an elite marathon runner. By elite I mean competing on a professional level or in the Olympics or something. Because of the change that the fibers are able to make, and because of the role of technique and training, you can still enjoy any sport you want and be good at these sports. In my opinion, genetics become a factor when seperating the 'good' level athletes from the 'awesome' level athletes of a particular sport.
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