Girth measurements are a reliable method of measuring body composition

Accuracy: Girth measurements provide a high-level assessment of an individual. When conducted properly, their accuracy is typically within 5% of the value measured using underwater weighing (the “gold standard” for body composition analysis). ... By measuring several sites, total body fat may be calculated.

Explanation:

Skinfolds are the most accurate way to measure body fat as long as the fold thickness is not converted to a percentage body fat. Generally, excessive body fat impairs athletic performance in activities in which body mass must be moved through space.

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