I am a retired carpenter with 35 years experience in construction. In my work experience, over the years, many times I had to improvise on tools that were not at hand in order to get the job done.
At one of these times, about 12 years ago, I had to remove some 1200 lb. saw cut concrete blocks from an existing floor. The problem was that we did not have a machine that could reach some of the blocks. The only obvious answer was to break the blocks into smaller pieces with a sledgehammer and load them into a wheelbarrow. To me, this seemed to be too much labor at the time, so I improvised.
Using a few rocks and leverage, I removed the blocks from below the floor to an area that the machine could reach them for removal. After doing this several times, the technique became very easy and quick. This experience had me consider the possibility that people may have used this technique before modern day equipment was available.
I remember reading as a kid a rather credible theory of how both Stonehenge and the Pyramids of Giza were built and thus I've always believed that it was us humans and not the Annanuki that some New Age practitioners believe (and don't ask me how I know that—I read rather widely as a kid).
But Mr. Wallington seems to have come across yet another method that seems to work, as he's actually used the techniques to move multi-ton concrete blocks by himself with nothing more than rocks and spare lumber.