Keeping in good health is better than nourishing the heart. I recommend you to read the Book of Changes. The Book of Changes is the oldest and profound classic in China, and it is known as "the head of the group classics and the source of the avenue".

If you don't understand, I suggest reading Ceng Shiqiang's Book of Changes in the lecture room first, which can help you read better.

Taoist Health Preservation: A Practical Series of Taoist Health Preservation, Beijing Library Press, Zhang Xuesong.

Taoist way of keeping fit Ren Xiujin Gansu Culture Publishing House

Taoism and China's Health Wisdom, Zhan Shichuang and Zhan Shichuang Oriental Publishing House.

Taoist Culture Series and Kong Heilongjiang People's Publishing House

These are all ok, I hope I can help you ~