The Ghost:NPCCreationGuidelines/Attributes/Strength
Strength
Strength: 1 and 2 STR don't need much in the way of further explanation: but the next four levels do.
3: For strength 3 is actually almost as common as 2: you are probably a sturdy yeoman farmer, a stevedore on the docks, or the strongest person in a family of intellectuals. Players and STs should feel justified giving any adult character 3 strength if they have a job requiring heavy lifting or strenuous activity or who 'works out'. Numerically people with STR 3 are one in 10
4: STR 4 however is much more unusual. If the character has STR 4 they almost certainly are both naturally stronger than average and have a job that requires abnormal physical exertion, such as miner, warrior, or farrier. Numerically people with Str 4 are about 1 in 1000
5: Str 5 is far rarer than even str 4. This is the province of Olympic weight lifters and animals such as horses. Players and GMs should not feel justified giving characters this level of strength unless they also have some kind of background such as cult or influence which marks them as being well known in their region. Numerically people with STR 5 are one in a Million.
6: This is the province of legendary heroes such as Samson, Goliath, Gilgamesh, Hercules, and Paul Bunion. People with this level of strength come along once in a millennium, other than among the exalted, appropriate god blooded, and animals.