Full disclosure, this question relates to the Marvel Comics conception of Thor going mano a mano with the Incredible Hulk, and taking some pretty big hits, including repeated hulkian punches to the face that drive his body into the dirt of the arena.
But there are many elements to the Marvel conception that are faithful to the mythological character. For instance, when Dr. Strange offers him tea, Thor is uninterested, but when Dr. Strange converts it to a huge mug of beer, Thor, very casually, nearly drains it in one go, and the mug magically refills, clearly a reference to the third ríma of the Lokrur.
So my question is this: what can we infer about Thor's physical resilience, particularly regarding physical punishment, from the actual mythological sources?