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Why did Neanderthals have such humongous right arms? (+video)

An analysis of Neanderthal bones indicates that they had disproportionately huge biceps and triceps on their right arms, and that spear thrusting does not seem to fully account for their lopsided muscles. 

Investigation of a recently discovered neanderthal skeleton reveals the substantial difference in the appearance of powerful muscles between neanderthals and modern humans. Interesting experiement video from BBC science show 'Neanderthal: The Rebirth'.
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The unusually powerful right arms of Neanderthals may not be due to a spear-hunting life as once suggested, but rather one often spent scraping animal skins for clothes and shelters, researchers say.

The Neanderthals are our closest known extinct relatives, who were probably less brutish and more like modern humans than commonly portrayed. Their brains were at least as large as ours. They controlled fire, expertly made stone tools, were proficient hunters, lived in complex social groups, buried their dead, and perhaps artfully wore feathers. Genetic research even suggests they interbred with modern humans.

Neanderthals apparently had unusually strong right arms, judging by their right humerus — the long arm bone underlying the biceps and triceps — which often boasted protrusions with which to attach powerful muscles.

"Neanderthals have really interesting upper bodies," researcher Colin Shaw, a biological anthropologist at the University of Cambridge in England, told LiveScience. "If you and I are both right-handed, you'd expect 4 to 13 percent asymmetry between our arms. Neanderthals have up to 50 percent or more asymmetry. They were doing something with their dominant arms that were either more intense or repetitive or both than we do today. The only population of modern people that we see who are similar are tennis players, who hit tennis balls many, many years aggressively." [Top 10 Mysteries of the First Humans]

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