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This study investigated the potential impact of a motor skill proficiency barrier on measures of cardiorespiratory (CRF) and musculoskeletal (MSF) fitness in youth. A sample of 241 youth (114 girls) aged 10 ‐ 18 years, completed the Motor Competence Assessment battery with composite scores indexed according to age‐ and gender‐adjusted percentile scores. Motor competence (MC) levels were categorized as low (≤ 25 %tile  – proficiency barrier), moderate (≥ 26 %tile  to &lt; 75 %tile ), and high (≥ 75 %tile ). CRF levels (Health Risk, Needs Improvement, and Healthy) were assessed using the Fitnessgram® 20 m PACER test. Low (≤ 20 %tile ), moderate (≥ 21 %tile  to ≤ 80 %tile ), and high (≥ 80 %tile ) MSF levels were assessed using grip strength normative data. Two 3 × 3 chi‐square tests were conducted to determine the probability of MC level predicting CRF and MSF levels. Results demonstrated statistically significant models for performance on both the PACER (χ 2 [4,  N  = 241] = 22.65,  p  &lt; .001) and grip strength (χ 2 [4,  N  = 241] = 23.95,  p  &lt; .001). Strong evidence of a proficiency barrier impacting CRF was noted, as no low skilled youth met the “Healthy” fitness zone standards for PACER performance. Evidence supporting a barrier with grip strength was not as strong, as 20.8% of youth exhibiting low MC displayed high grip strength. However, all individuals with high levels of MC demonstrated at least moderate grip strength. Results emphasize the importance of developing MC during childhood as it may provide a protective effect against unhealthy CRF and MSF across youth.

Potential relevance of a motor skill “proficiency barrier” on health‐related fitness in youth