sergio wasnt weak, in the latter years of his career injuries forced him to use more pumping style workouts. in the early 70s sergios thighs where some of the best in that time, certainly better than arnolds. sergio was also famous for his very thick pecs..so your walking on clouds with that statement shadow. and his calves where very good for his time..specially for a black dude. and sergio had amazing arms..biceps+triceps...very low insertion points.