Fitness and beauty can be one and same. Being fit and healthy will automatically make you look better. A healthy inside creates a healthy outside.
Fitness through exercise can help you to maintain a healthy body weight and improve muscle tone.
Our looks reflect sum total of who we are and how we live, and best we can do in life is to make best of what nature has given is, without excuse, apology, or pretense. If we try to live otherwise, we find ourselves acting on a stage with other actors and actresses--great pretenders without real friends, without real lovers, without real relationships.
While we realize that there is such a thing as "natural beauty," which is beyond all standards of culture and history in some sense, there are also "relative" standards of beauty.
We all know about fads, styles, and adornments that are "in" one season and "out" next. This includes cosmetics, hair styles, clothing, and even body weight and size.
These standards may vary from country to country, year to year, or even among different age groups in same country and year.
For example, full figures are considered ideal in some historical periods, but slender figures are valued now--at least in Western countries.