Total wellness is a very important aspect of one's wellbeing, as it encapsulates the factor of ones mental, physical, and social wellbeing. Without a good total wellness, by definition -- you aren't leading a fulfilling life. It is very important that you focus on your total wellness, to help make yourself whole.
Physical wellness is incredibly important because it can make or break a life or death situation when it comes to your own personal health. A good physical wellness leaves you with a longer and more fulfilling life.
Setting goals for yourself is very important because it helps organize your life. With an organized life, you can be more efficient.
Assessing your health and fitness is very important because it gives you a guideline on creating new goals for yourself physically, and allows you to be aware of potential issues or improvements that could be made.
Selecting your physical activities is very important because it allows you to be as efficient as possible when fulfilling goals with regards to your physicality. Without any direction to your physical activities, you will lack efficiency -- and it will drastically lower progress.
Having lifestyle guidelines, or understanding lifestyle limitations is very important because it increases all the types of wellness previously talked about. It helps organize your life, and limitations in general. Lifestyle guidelines are big picture and impact all other types of wellness.
Nutrition is so important because it is the fuel for everything else. Nutrition obviously impacts physicality and health, but it can also impact your mood and emotions. A good nutrition could balance yourself not just physically, but with regards to mood too. Nutrition is the fuel to everything.