What is the meaning of "va'Yisa'em"?
Rashi: He uprooted them from their place.
Malbim: This shows how easy it was for him. Through going himself, he took them with him. The same applies to "va'Yisa Es ha'Yesad ha'Ereg" (verse 14); it should have said "va'Yasi'em."
The doors of Azah were 60 Amos wide. How could Shimshon carry them on his shoulders?
Chidushei Agados Maharal (10a): Sixty represents full strength. (There were not literally 60 Amos between them.) Maharsha (10a) - this is like one who carries a long pole.
Torah ha'Temimah citing Ben Yehoyada: This cannot be understood simply, for then (if his body had normal proportions) he was more than 100 Amos tall, and he could not live among people (e.g. enter a house. Was he intimate with his wives in the open? He intended to enter the room of his first wife (15:1)! How did Anshei Azah plan to kill him? His volume was like that of 200,000 men! Why did Pelishtim think that there is a secret to his strength (verse 5)? - PF) Rather, he had strength between his shoulders to carry a load (the doors) 60 Amos wide.
Maharsha (10a): The verse implies that the doors rested totally on his shoulders, and not only a minority of them, like one who carries a long pole (he balances it so the middle is on his shoulder).