Raw strength plays into it quite a bit. Back home, I was able to use a skyscraper sized knife with my bare hands and I could easily pummel the ground. A single blow from me could kill.

But those abilities are pretty reduced here. I'm still quite a strong person - I can crash through bricks and cinderblocks and wood without difficulty so strength definitely plays into it but you have to weaken the contents of the rock first with water or something. Make it crack so you can make it break!