The article presents the results of the research on the problem of the motor training and sport results indicators for the athletes specialized in long jump with a running start. The research has used methodology and algorithm for sports result modeling and motor readiness index developed in VNIIFK. The base for model description calculation was the data got on the long jumpers (12-17 years (n=162)) testing and retrospective analysis of the rates being investigated at running long jumpers of high professional skills. The results found have been used to calculate the fluctuations range of the values required. These values variation within the limits determined is obtaining standard characteristics and allows showing as an interval form the necessary level of sportsmen readiness at the age-related aspect.