Wellness is important when choosing to maintain a healthy lifestyle. Wellness is a choice to assume responsibility for the quality of your life. It begins with a conscious decision to shape a healthy lifestyle. Wellness is a mind set, a predisposition to adopt a series of key principles in varied life areas that lead to high levels of well-being and life satisfaction.

Wellness - noun.
1. the quality or state of being healthy in body and mind, esp. as the result of deliberate effort.
2. an approach to healthcare that emphasizes preventing illness and prolonging life, as opposed to emphasizing treating diseases.

More definitions:

Wellness is the physical state of good health as well as the mental ability to enjoy and appreciate being healthy and fit.

Wellness is a state of balance between health and fitness physically, mentally, emotionally and spiritually.

Wellness is an interactive process of becoming aware of and practicing healthy choices to create a more successful and balanced lifestyle.