There's a rough stone ledge next to the bronze reward sitting beneath the suspended blocks. Go around behind it and climb on top of it.
Jump to grab the edge of the nearer block and pull up.
Cross over the top of the first block and stand facing the second. Lara's weight carries the first block down, causing the second block to rise. Wait for the second block to move a little higher than the first. Then either jump onto it or jump to grab the edge and pull up.
As the second block descends, run across it and jump to grab the ladder. Climb to the ledge above and CHECKPOINT 8.
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