The purpose of this study was to study the content of free and bound carnitine in the blood of young athletes involved in various sports. 101 young athletes of various sports qualifications at the age from 15 to 17 years old were examined. For the research, young men were divided into two groups: I - types of sports of complex impact (football) - 38 people, II - cyclic type (rowing) - 31 people. Girls (32) are divided into three groups: I - types of sports of complex impact (football) - 14 people, II - a cyclical sport that predominantly develops endurance (rowing) - 6 people, and III - a complex coordination sport (rhythmic gymnastics) - 12 person. It was revealed that the assessment of carnitine metabolism indices allows predicting the degree of physical working capacity of athletes involved in various sports. At the same time, it was found that indicators of carnitine metabolism, body composition, have prognostic value in assessing the physical performance of young athletes.