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Aerobic fitness (VO 2 max) is a key component of youth fitness testing. Criterion-referenced (CR) assessments are used in FITNESSGRAM ® to assess health risk.The purpose of this study was to develop and cross-validate regression models to estimate VO 2 max from Progressive Aerobic Cardiovascular Endurance Run (PACER) 20-m shuttle run performance in boys and girls aged 10–16...