Strength is more closely correlated with muscle density than size: https://pubmed.ncbi.nlm.nih.gov/32768372/ https://pubmed.ncbi.nlm.nih.gov/32768372/ Powerlif

Strength is more closely correlated with muscle density than size: https://pubmed.ncbi.nlm.nih.gov/32768372/ https://pubmed.ncbi.nlm.nih.gov/32768372/ Powerlifters who train for strength generally train low-rep, high-weight progressive overload programs and often end up with very dense musculature, while bodybuilders prioritize high-rep sets for large amounts of total volume, which produces relatively more muscle size but not necessarily superior muscle density. The two modes of training produce different hypertrophic effects. https://pubmed.ncbi.nlm.nih.gov/3057312/ https://pubmed.ncbi.nlm.nih.gov/3057312/ > It appears, though, that bodybuilders, relying on a high repetition training system, in contrast to Olympic weight- and power lifters, display a small increase in number of capillaries per fiber. > Bodybuilders, as opposed to Olympic weight lifters, power lifters, or other power athletes, tend to display a relatively high percentage of slow switch fibers.