What does skinfold testing predict based on measurements taken with skinfold calipers?

Skinfold testing is a widely recognized method for estimating body composition, specifically the percentage of body fat. When using skinfold calipers, the measurements taken at various sites on the body represent the thickness of the subcutaneous fat layer. By applying these measurements to established formulas and equations, one can predict an individual's overall body fat percentage. This method is rooted in the assumption that the amount of subcutaneous fat is proportional to total body fat, making it a useful tool for assessing body composition and tracking changes over time, especially in fitness and health contexts. The other options, such as muscle endurance, maximum oxygen uptake, and flexibility levels, are not directly assessed through skinfold measurements and require different testing methods to evaluate those specific physical fitness components.