Albert Barnes Commentary Psalms 66:11

"Thou broughtest us into the net; Thou layedst a sore burden upon our loins." — Psalms 66:11 (ASV)

Thou broughtest us into the net—that is, You have allowed or permitted us to be brought into the net; You have allowed us to be taken captive, as beasts are caught in a snare (see the notes at Psalm 9:15). The allusion here is to the efforts made by their enemies to take them, as hunters lay traps, or spread nets, to capture wild beasts. The idea here is that those enemies had been successful; God had suffered them to fall into their hands. If we suppose this psalm to have been composed on the return from the Babylonian captivity, the appropriateness of this language will be apparent, for it well describes the fact that the nation had been subdued by the Babylonians and had been led captive into a distant land .

Thou laidst affliction upon our loins—The loins are mentioned as the seat of strength (1 Kings 12:10; Job 40:16). The idea here is that He had put their strength to the test. He had tried them to see how much they could bear. He had made the test effectual by applying it to the part that was able to bear most. The idea is that He had called them to endure as much as they were able to endure. He had tried them to the utmost.