Meaning of the word "there is nothing so good for the inside of a man as the outside of a horse" in English

What does "there is nothing so good for the inside of a man as the outside of a horse" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

there is nothing so good for the inside of a man as the outside of a horse

US /ðɛr ɪz ˈnʌθɪŋ soʊ ɡʊd fɔr ði ɪnˈsaɪd ʌv ə mæn æz ði aʊtˈsaɪd ʌv ə hɔrs/
UK /ðɛər ɪz ˈnʌθɪŋ səʊ ɡʊd fɔː ði ɪnˈsaɪd ɒv ə mæn æz ði aʊtˈsaɪd ɒv ə hɔːs/
"there is nothing so good for the inside of a man as the outside of a horse" picture

Idiom

a proverb suggesting that horseback riding and being around horses is beneficial for a person's physical and mental health

Example:
After a stressful week, I went riding because there is nothing so good for the inside of a man as the outside of a horse.
He recovered from his illness quickly by spending time at the stables; there is nothing so good for the inside of a man as the outside of a horse.