Plain and simple. Instead of count the rocks one by one, you count by 10.
10 + 10 + 10
10 + 10 + 10
(Mastery scheme for example)
Really, this is almost magic. I was struggle with FL/PE2 and the volume as of week 9. Week after week I got failure on 3º set around 40 rocks... 4 and 5 sets same... I pushed myself but I did lost the form... until this week. I tried on monday a different way to count the rocks, 10 by 10 and... magic.
I went from failure on 3rd set few weeks ago to complete mastery 5x60 today, that is my deload but I don't care. Plus... EFFORTLESS.
I don't care why this works, but confirm what Coach says about mind gives up before the body does.
And I suppose that it would be use for any type of rocks PE.