Physical health gives us the energy to enjoy life and carry out our God-given purpose with enthusiasm. God is interested in every part of our being - spirit, soul and body. Health doesn't just happen. It is the result of habits. Habits such as what we eat, the activity we engage in, and the rest we take.
I highly recommend Tom Wrath's practical book Eat Move Sleep which is about the big impact of small daily choices. It's an easy read but highly motivational and full of good advice for improving your health and well-being. Well worth the investment.