I wrote a brief blog about the mobility of ancient man awhile back and finally came across the original research in another article I was reading. Outside magazine wrote an article entitled "How Far Fitness Has Fallen," essentially stating that today's person would get their butt kicked if he got into a fight with his ancient ancestor.
The article states that 30-150,000 years ago, ancient man traveled long distances hauling all kinds of weight. Today's man, does no such thing. Ancient man was a "monster" in comparison. Extreme mobility in the late Pleistocene.
The main method of comparison was tibial bone rigidity and strength.