Fitness improves when the body has more muscle and less fat. (Okay, you already knew that.) The way to improve your muscle:fat ratio is with a focus on strength training, supplemented with aerobic conditioning. Strength training increases metabolism, while aerobics burns extra calories and fat.
Body composition is also a measure of health, since additional stores of fat in the body - like around your waist, hips, arms, back, and thighs - are linked to a number of serious problems that exercise helps alleviate, like high cholesterol, heart disease, diabetes, and some cancers.
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Bodybuilding requires commitment. It is a totally different lifestyle that entails letting go of old habits and adopting new ones. You cannot go into bodybuilding and be half- hearted about it. It is a test of strength, self-discipline and willpower. Start only when you are sure you can commit time, effort and energy. Learn tips like this one and 99 more.