The reason for the current state of your health is found in your daily routine.
If you're wanting to create health, change your routine. It's the small changes each day that lead you to significant ones because changing is living; stagnation is death.
It's best to equip your body with the means it needs to keep up with your environment: exercise, breathe, hydrate, nourish, meditate, rest--this isn't your New Year's resolution; this is your daily routine.
So honor your body. It's the one vehicle given to us for this lifetime.