Is it an idiom to keep fit?

"A healthy mind and a healthy body" is not an idiom. There are only four idioms of "Kang () ()":

Kangzhuang Road 1

bright road

Explanation: spacious. A wide and flat road extending in all directions. Metaphor has a bright future.

The source of Mao Dun's "Reading Occasionally at Night": "The prosperity of socialist countries has pointed out the broad road for the people of the world."

2. Kang Qiang meets good luck

Kang Qiang feng Wu

Explain Kang Qiang: Happy and strong; Ji Feng: Meet Geely. Congratulations to the elderly for their good health and grandchildren.

Source "Shang Shu Hong Fan": "Strong and strong. Children and grandchildren are fortunate. "

3. Song of Kang Zai

I love you

Explanation: Taiping. General Introduction to Ode to Taiping

The source "Shangshu Yiji": "It is a song saying:' The head of state is bright, the thighs are good, and the ordinary things are healthy. "

4. Wide roads

kāng zhuāng dà dào

It means everything is fine: flat and easy to reach. A wide and flat road extending in all directions. Metaphor for a bright future.

The source "Er Ya Shi Gong": "Four tours are for bending, five for health, and six for Zhuang."