We know that the mind/body builds what for convenience we call "muscle memory" based on repetition. Yet the common "L-R-L-R, then switch roles" does not really provide repetition regardless of how many times one goes through the sequence.
So...how does it not "provide repetition"? Does that phrase mean something other than the obvious, plain-English meaning? Is it not repetition because there's a change, albeit a minor one, each time? To be "repetition", must it be a sequence of the exact same thing?