Let's not continue this here. If you are really interested, go talk to any local sports scientist involved in professional or olympic level sport and ask them their expert opinion.
Or, put your email on your profile and I'll fill you in privately.
Or, put your email on your profile and I'll fill you in privately.
Is it a fact? Who are "these people"? Perhaps there's a URL you could provide that tells authoritatively the story of how certain swimmers in Beijing decided to not ride bicycles?
That URL