Use Your Head Before Your Back
As a landscape contractor, I move a lot of stone, brick and concrete blocks by hand. I have one basic rule: Use your head before your back. Whenever you face a heavy rock, timber or pile of bricks, stop and consider the various options you have for moving it.
Reject any technique that might cause a serious strain, especially to your back. The safe method may require you to make more trips, rent better equipment, ruin more of the lawn or spend a bit more, but don’t take chances with your health.