The look is part of it.....

As a persomal trainer i tell my clients and people in general that the main purpose to stay fit is health, BUT....... Looking great comes as a part of the lifestyle it self and as a bonus makes us feel good among others, boosting our self e-steem. (misspelled as a joke)
So keep that in mind, start a healthy lifstyle and let your consistency do the rest. You gonna feel and look greater than ever!