I usually use these books to discuss a theme in school and also to work on reading skills with my 4-6 year olds. This book practices the sight words "I" and "can."
It contains the following sentences:
I can eat healthy food.
I can drink water.
I can exercise.
I can sleep.
I can be clean.
I can be healthy!
I simplified "practice good hygiene" simply to "I can be clean," but I think it's a good opportunity to introduce the idea of hygiene and that keeping your body clean can help you stay healthy.
Included are the big book for the teacher and two versions of mini books. One is already prepared, the other has sentences, but students must either glue in the appropriate picture (provided) or draw their own picture. The last page, "I can be healthy!" should be a self-portrait of the kids.
I have some more health-related activities in the works in my head, but I hope I'll have time to make them a reality soon.