Blocks were transported of large 'sleds', like in this picture.
According to Dailymail a sledge glides far more easily over firm desert sand simply because the sand does not pile up in front of the sledge as it does in the case of dry sand.
But they were also much more stronger then we are now, said Dr. Rudolf Steiner, but we do not understand all about the evolution of materia. The `materia´ is getting old, and will lose those own vitality.
We will see that human becomes more powerless on this degeneracy line.
This is one reason to memory- and the brain neurodegenerative diseases.
The second reason is that we do not use the brains (this is the objective of the pharmaceutical industry).