Health means the state of being free from illness or injury. Fit means in good health, especially because of regular physical exercise
In today's era, health is wealth. and without health 
everything is useless. So, each and every person 
must maintain his or her health. You must do 
exercise too to keep your figure in shape. It makes 
so much difference in your personality. Even for a 
good personality you must maintain your health. 
 We can improve our physical fitness by exercising regularly in the morning, and evening.  We can do walking in fresh air or jogging near parks.
We can maintain mental fitness by regularly exercising of the mind, by reading, writing, problem solving and learning new topics.