RE: original topic.
As many peeps have discussed, definitions and sample groups determine the outcome of this inquiry. How do we define “strong”? Who qualifies as a bodybuilder? Whose strength levels are those bodybuilders’ strength levels compared against? I suggest the following parameters -
Strong - 1RM on squat, deadlift, bench press, military press; max number of strict bodyweight pull-ups. I chose 1RM and max number because those are the standard measures used by the majority of people with whom I discuss strength and lifting; many articles about strength are directions about increasing 1RM; and the general American public and Olympics weightlifting viewers worldwide appear to equate strength with 1RM.
I selected those five lifts because they’re commonly performed on a regular basis in the many gyms I’ve trained at through the decades (subjective view); powerlifting is a professional sport that measures three of those five lifts (objective factor); strongman is a professional sport, and the barbell overhead press is a lift readily available to commercial gym-goers that expresses strength similar to what’s used in strongman competitions; and maximum rep, strict pull-ups are a measure of strength in various military training groups, are commonly performed in gyms, and were used in federal childhood fitness standards. For instance, in order to pass P.E. class, we boys had to do a minimum of five when I was in the fifth grade.
The next question is who qualifies as a bodybuilder. I suggest anyone who’s competed on stage, whether paid or unpaid. It’s a very open-ended measure, for sure. For the sake of the OP, if we were actually going to quantify data, I’d suggest limiting the sample to IFBB card holders.
For the last question, I think a two-part two comparison of relative strength level is valid. Since strength is relative to the group being compared against, measure bodybuilders against the general population, which will include untrained and trained people, and also measure against other pro athletes.
Compared to the general population, the average competitive bodybuilder (mean 1RM strength) will likely be very high. Compared to pro athletes in general, everyone from golfers to World’s Strongest Man competitors, I’d guess bodybuilders’ mean strength would be higher than the general poplulation’s mean. Compared to strength athletes though, I’d presume bodybuilders would not express greater strength and would, in fact, show lower mean strength at the five prospective lifts.