Supermans strength does not 'fit' in with his weight.?

personally, i dont understand the concept of supermans strength. He has normal weight for a human, yet the strength of 1000 men. What im saying is, how can people/benches/cars withstand (lift) superman/Kent, yet a grenade will not make him move! is it precise muscle control? Is it because his dna allows light yet... show more personally, i dont understand the concept of supermans strength. He has normal weight for a human, yet the strength of 1000 men. What im saying is, how can people/benches/cars withstand (lift) superman/Kent, yet a grenade will not make him move! is it precise muscle control? Is it because his dna allows light yet powerful muscle?
Update: dont say 'its fictional/comics etc' i don't care im just doing it out of curiousity.
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