Women are attracted to a lean, athletic physique. Ya'll ever seen women around male strippers? They go wild. Why you think NBA players are the top choice of IG models or women who are in the top tier of desirability and status. Women are also attracted to very handsome faces. Life isn't fair, some men hit the genetic lottery and some don't. Ya'll seen that dude who's mugshot literally got him famous and a number of lucrative opportunities when he was released? god bless him.
A man can be average in the looks department but have strong masculine sex appeal (confidence, sexual prowess, etc) this is another attraction trigger for women, as well as strong verbal game. These are all things that don't require resources.
Men who lack in the above areas usually need to present beta qualities to have sex with women (money, non sexual companionship, attention, wine and dine, etc.)
In conclusion, being in shape and owning an athletic physique does give men an edge, but this alone won't guarantee success with women.