What technique can be used to assess body composition?

Skinfold measurements are a widely used technique to assess body composition because they provide a direct estimation of subcutaneous fat by using calipers to measure the thickness of skinfolds at various sites on the body. This method relies on the principle that subcutaneous fat is a significant proportion of total body fat and can provide valuable insight into an individual's body fat percentage.

By taking measurements at specific locations (such as the abdomen, triceps, and thigh), trainers can estimate total body fat and assess changes over time, which is critical for designing effective fitness programs. The accuracy of skinfold measurements can be enhanced when performed by a trained professional, ensuring consistency and reliability in the data obtained.

In contrast, other methods listed do not serve primarily to assess body composition. For instance, while BMI calculations can categorize individuals based on weight and height, they do not distinguish between fat mass and lean body mass. Heart rate monitoring focuses on cardiovascular fitness rather than body composition. Flexibility tests evaluate the range of motion in joints and are unrelated to body fat assessment.