While it's hard to nail down what the exact stats of a paleolithic athlete would be, there is evidence that paleolithic men living off hunting and gathering were more physically robust than those living off agriculture up until the 20th century; looking back at paleolithic skeletons, we find that not only are their bones longer (average height hovering around 5'10" in men) , but also comparatively more dense, and had healthier teeth as well.

Study on paleolithic height and weight from Dr. Michael Hermanussen here: http://www.hormones.gr/127/article/article.html