We could certainly make lift big, eat big, and grow big more complicated.
Lift big could have explanations of progression, intensity, muscle types, muscle functions, etc.
Eat big could have explanations of calories, micro and macro nutrients, energy systems, etc.
Grow big could have explanations of protein synthesis, cellular breakdown, super-compensation, etc.
I guess it depends on how deep you want to get into it. But good routines will work with or without the science behind it.
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