Purpose: Despite recent updates to international normative values for physical fitness in young people, contemporary data sets from England are sparse with no published data available from the North East. We compared physical fitness in children from one primary school in North East England to International and European reference data, and other English regions. Methods: Eighty participants (mean age [SD]: 9.1 [0.6] y) completed a testing battery of 20-m shuttle run test, handgrip strength, standing broad jump, and sit-and-reach. Scores for each component were assessed against International or European age-and sex-specific centiles, then grouped into quintiles. Differences between our sample and European and English data sets were explored using z scores and t tests. Results: For all components, ≥58% of participants were classified as having "moderate" or lower levels. Twenty-meter shuttle run test performance was not substantially different compared with other English data sets. For handgrip and sit-and-reach, our sample scored significantly worse than South East children. Standing broad jump distance in girls, and handgrip in boys and girls, was significantly lower than North West equivalents. Conclusion: Physical fitness levels in primary school children from North East England are suboptimal, highlighting a need for large-scale monitoring studies to build on our preliminary findings.Physical fitness can be defined as a set of characteristics related to health and performance, including aerobic fitness, muscular endurance, strength and power, body composition, flexibility, balance, agility, and reaction time (7,22). In children and adolescents, the characteristics directly attributable with health improvements are aerobic fitness, body composition, flexibility, and muscular fitness-a collective term representing muscular strength, local muscular endurance, and muscular power (39)- (7,20,21,47). Of these, aerobic fitness-often defined as the ability of the working muscle to receive and utilize oxygen for energy production during exercise (4)-is a strong summative marker of physical health (30); with peak oxygen uptake (VO 2 peak)-the highest rate at which oxygen can be consumed during exercise (4)-widely recognized as the best single measure of aerobic fitness in young people (5). As VO 2 peak is highly correlated with body mass, this is typically controlled for by dividing peak VO 2 (mL/min) by body mass in kg and expressing it as a ratio of mL/kg/min (4). Higher levels of aerobic fitness are associated with reduced risk of future metabolic and cardiovascular disease; obesity and mortality (9,38); better mental health (30); and potentially higher levels of academic achievement (19). There is also accumulating evidence linking higher levels of muscular fitness with various physical and psychological health benefits in young people (39), some of which are independent of aerobic fitness.Despite the well-documented benefits of higher physical fitness in youth, debate remains over whether aerobic fitness in young p...