The German and British navy's, with cannon power and armed troops, were the reason the Samoa's were taken at first. There are two Samoa's. Present Samoa was called German and later Western Samoa. The other half of the island chain is America Samoa. Samoa is 3 times the population of American Samoa. I lived in California since I was 10. Can not vote in any election because I would be considered an American national.
Not all Samoans are super sized and strong. Those most are. The large bone and joint structure make them so. Benching and overhead pressing seems to come natural. Though the hip and leg strength can be be even more impressive. Even some of the women are extremely strong. My two cousins were benching 400+ while in the 11th & 12th grades in high school, at around 190-200lbs. One cheat curled 220 for reps. Later both played college D-1A, as I did.
Samoans are not that big on working out unless there is a good reason for it. They, for the most part, are well muscled and strong, so why bother exercising. Lifting a 40oz may seem more reasonable to some of them. The NFL is one good motivator for a lot of football players today. The Mormons brought over college guy's to play in the Utah schools.
Samoan's do feel pain like anyone else. Though kind of a delayed action. Hard to explain really. Also tend not to show anything is wrong,that they actually be hurt. No pain, no gain I guess. They do not act like some other races who act like drama queen when only slightly hurt. I will not mention names.
And to add to all of this: If GB was a village than Method101 would be the village idiot.