i believe this is incorrect.
the human spirit can overcome any ostacle ursus - just like you with the bull
If that was so, then Rich Gaspari would look like Paul Dillett and Paul Dillett would be looking like Method101.
You can't change your genetic potential using sheer will and effort. Yes, you can make your arms grow bigger and bigger, with or without steroids, but they'll never look like Ronnie Coleman's. You can't overcome metaphysical constraints, like your physical traits, for example (hair color, height etc).