eli5: Why do people who are actually strong look different than bodybuilders who train all week?

Question

eli5: Why do people who are actually strong look different than bodybuilders who train all week?

In: Biology

Answer 1

Also, the proportions of body builders are different that people who are focused on the work. There are plenty of youtubes showing a BB who is bigger and stronger getting choked out by a smaller MMA fighter.

Look at boxers. They need strength and endurance, but they typically have biceps and chest muscles that are nowhere near the proportions found on the average BB.