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?

"let's agree to disagree."

Nah. Your previous statements, vague evasions and dismissal of the obvious (even when backed up by evidence) incline me to believe you're merely stretching any truth you may possess and are not a reliable source of information. But then Robert Trivers seems to say we should expect that from everyone, so big dea.