[blintson]

If conveying that information in your voice is useful, it's also very useful to be able to fake it. I lifted weights in high school, went wakeboarding with people and (briefly) went to an MMA gym. I've met skinny people with deep voices and ripped people with high voices and vice versa. I wasn't able to find a link to the original study, but I think they're completely wrong, and the correlation is nonexistent or negligible.

[milkshakes]

The article implies that there's more to it than pitch:

Sell and his colleagues could not precisely pinpoint what qualities in a man's voice indicate strength.