Reference values on percent body fat are essential in fitness programmes in identifying variations of body fat from normal and in clinical assessment of overweight and obesity. Accurate evaluation of the presence of excessive body fat is an important step to initiate preventive or treatment programmes. Therefore, clinically useful gender and age reference cut-point for the definition of excessive body fat is imperative. This book presents a study on gender and age reference norms for percent body fat among young adults using the skinfold caliper and the Bio-electric Impedance Analysis.