YOU SAID:

It is because I'm a healthy as a horse

INTO JAPANESE

馬のように元気な馬だからだ。

BACK INTO ENGLISH

Because he is a horse as energetic as a horse.

INTO JAPANESE

彼は馬のように元気な馬だからだ。

BACK INTO ENGLISH

Because he is a vigorous horse like a horse.

INTO JAPANESE

彼は馬のような元気な馬だからだ。

BACK INTO ENGLISH

Because he is a vigorous horse like a horse.