Physical and mental fitness can be important contributors to the quality of your life. You'll enjoy the maximum possible mobility and independence. You can do more everyday things like shopping and household chores for yourself. You'll be able to engage in the widest possible range of activities and pursue broader interests. You can travel more easily. You'll have more strength and stamina to do the things you enjoy. 

Exercise is also a great way to relieve stress. It clears the mind. You'll probably sleep better and may find that your appetite and digestion are improved. You'll have fewer aches and pains