Objective of the study was to offer and substantiate a set of educational provisions for the performance and postural control balancing tools to control the key muscle groups in junior rifle shooters. 13-15 year-old rifle shooters were subject to the study. Applied for the study purposes were the educational process monitoring, questionnaire survey, interviews and medical record analyses to detect and analyze the musculoskeletal system imbalances due to the disharmonizing effects of prolonged competitive routines. The study data and analyses found the statistically significant benefits of a set of special postural control tools designed to minimize the pain syndrome and musculoskeletal fatigue by the following: corrective shifts in the vertical projection of the lead arm backward from the same-side hip joint projection; shifts of the lead arm shoulder joint towards the chin; backward shifts of the shoulder blade with the shoulder cross-line moved forward etc. A factor analysis found the following key factors of influence: correlation of the gun-up posture control parameters with the muscle-group-specific fatigues; endurance/ willpower factor of the competitive success that, on the negative side of it, forces the adolescents stand pain despite the growing muscular discomfort. The imbalances detected by the educational process tests demonstrated the need for the competitive performance standards of the junior rifle shooters to be corrected by a set of special physical practices meant to: strengthen the musculoskeletal system; correct the postural control skills with a contribution of the relevant body conditioning tools; build due static/ dynamic balancing skills and special strength abilities by weight flexion-extension/ shifting/ waving practices with ±3s time controls in every version of the gun-up posture.
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