[hcarvalhoalves]

Please point where I say "only".

All I'm saying is that rich, "alpha" male are in the best position to frequent gyms heavily and bulge muscle. They have the drive, the time and the money. I think the study reached at this data, then (IMHO, wrongly) concludes there's a correlation (strong men choose competition over collaboration) instead of a causation (egotistical rich men have bigger biceps).

Also, biceps circumference only relates to fitness or strength up to a certain point, hypertrophy is left to bodybuilders. Just look at the average tribesman for examples of extreme fit people with average body measures.