He finds no delight in the strength of a horse

"Strong horses do not delight him"

the strong legs of a man

Possible meanings are 1) "strong legs" is a metonym that represents how swiftly a man can run. AT: "men who can run swiftly" or 2) "strong legs" represents the strength of the whole man. AT: "how strong a man is" (See: rc://en/ta/man/translate/figs-metonymy and rc://en/ta/man/translate/figs-synecdoche)