常用的是：keep healthy

1.Right as rain

I felt awful yesterday, but today I feel right as rain.

昨天我很不舒服，但是现在我完全好了.

2.Fit as a fiddle

My father is fit as a fiddle.
我的爸爸身体健康.

3.In the pink

She is in the pink .
她身体非常健康.

4.I can't think but that I'm healthy。
健康至上.

5. Bill is in the best of health.
比尔身体非常好.