[Pharmboy]

I agree...I had the same thought when I first saw them.

I guess they compute it based on: 1) bone thickness comparison for same height human and neandertal and 2) how big the insertion of the muscles into the bone was.

[Drammach]

Here's a link to an article on Neanderthal morphology..
Discusses the skeletal and musculature attributes you are discussing..
Some interesting conclusions concerning behaviour, mobility, etc. are made..

http://www.geocities.com/CapeCanaveral/Launchpad/3917/morph.html