Even though our genetic manipulation technology isn't good enough to reliably augment our natural abilities, it might be good enough that countries without ethical qualms about human experimentation are already at work creating super-athletes. Sure, most of the experiments will be failures, but if the high defect rate doesn't bother you then why not throw a few thousand darts and see if anything sticks?
Assuming that these augmented athletes will age at a normal human rate, we should expect to start seeing the successful experiments show up at the Olympics by 2024.
