In the Old English poem Beowulf, what are some examples of Beowulf's superior strength?

Beowulf does a number of things in the epic Beowulf that show just how great his strength is.

The most dramatic act, and the one that stays with most people, is when he tears the arm off the monster Grendel, who has killed a lot of people. He doesn't use any weapons, but does this with his bare hands.  That's extremely strong.

There are other examples too though. Well before the encounter with Grendel, Beowulf went swimming--and carried his sword in one hand! Since he was swimming in order to fight sea creatures, he was also wearing mail. It's hard enough to swim in waves naked. To do it in clothes, with one hand holding a weapon, and wearing armor must mean he's very strong. Add to that the fact that he swam for five straight days and nights, and you have some sense of just how strong Beowulf was. He topped off his swim by driving his sword into some of the sea creatures, killing nine sea monsters.