The upper body muscular endurance of males and females 2-5 years of age was assessed, and relationships relative to sex, age, endurance and selected anthropometric measures were investigated. None of the relationships were found to be of practical predicative value; while upper body muscular strength increased with age, no significant differences between total sample sex or sex within each group were found. Height and weight were determined not to be of practical predictive value in upper body muscular endurance performances. (JD)