Is 'heavy' a weight and reps range or is it effort? The latter obviously unable to be quantified. One guy doing sets of 6-8, 'heavy', but how hard is he training? What's left in the tank? What does 'heavy' imply, one or two reps left? None? All out balls to the wall, beyond failure? Useless terminology, I agree. Anyway lol...
I did want to add this. The genetic mutant from his very own galaxy STILL had to bust his ass to be the best. You'll never hear anyone say Ronnie was eating shitty or training like a pussy. Day in, day out, that dude lived the life of a hardcore bodybuilder every single minute. Even as gifted as he was, he was known for being very disciplined and sticking to the plan 100% Genetics mean a lot, obviously, but consistency is the factor that separates the wheat from the chaff