祝你身体健康的英文是什么

Well, if I were to say it in a more natural, conversational way, like someone who's been in the Q&A game for ten years, it might go something like this:
"Um, you know, I was thinking about that... 'May you be as healthy as a horse' or 'Wishing you good health and lots of it'... something like that, you know?"

祝你身体健康的英文表达可以是 "Wish you good health." 或 "Best wishes for your health."