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I try to look after a communal grassy area (drying green) for a block of flats. I fork the soil and often end up digging out fist sized rocks. A few years ago I stuck my fork in where the grass wasn't growing and found the top of a rock. If it is an erratic boulder, it is a few feet in diameter, much like the rocks that he splits in the video. I've been wondering how to get rid of it. I've started a compost heap, to have soil to fill the hole, should I eventually succeed. I've tried using a diamond cutting disk with an angle grinder, and made disappointing progress.

If a stone mason wants to break rocks using feather wedges, he does a skilled job, to get a flat break. What the video makes clear, is that just breaking the rock, so that you can get rid of the top six inches, is a low skill task. I should buy some feather wedges and give it a try :-)