The International FItness Scale (IFIS) is a self-reported measure of physical fitnessthat could easily. This scale has been validated in children, adolescents, and young adults;however, it is unknown whether the IFIS represents a valid and reliable estimate of physicalfitness in Latino-American youth population. In the present study we aimed to examine thevalidity and reliability of the IFIS on a population-based sample of schoolchildren inBogota, Colombia. Participants were 1,875 Colombian youth (56.2% girls) aged 9 to 17.9years old. We measured adiposity markers (body fat, waist-to-height ratio, skinfoldthicknesses and BMI), blood pressure, lipids profile, fasting glucose, and physical fitnesslevel (self reported and measured). Also, a validated cardiometabolic risk index was used.An age- and sex-matched sample of 229 Schoolchildren originally not included in the studysample fulfilled IFIS twice for reliability purposes. Our data suggest that both measuredand self-reported overall fitness were associated inversely with adiposity indicators and acardiometabolic risk score. Overall, schoolchildren who self-reported “good” and “verygood” fitness had better measured fitness than those who reported “very poor” and “poor”fitness (all p<0.001). Test–retest reliability of IFIS items was also good, with an averageweighted Kappa of 0.811. Therefore, our findings suggest that self-reported fitness, asassessed by IFIS, is a valid, reliable, and health-related measure, and it can be a goodalternative for future use in large studies with Latin-schoolchildren from Colombia.