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The paper presents new scientific facts of the efficient biomechanical analysis and assessment of the indices of sports technique key elements in the phase structure of acrobatic exercise connecting moves: round-off - double salto backward tucked performed on the beam and round-off - double salto backward tucked during beam dismount, by the method of motion postural cues. Skilled and highly skilled female gymnasts took part in the study. Their average indices of height, body mass and age (x ± δ) were as follows: 157.5 ± 2.85 cm; 51 ± 2.25kg; 20 ± 2.35 years, respectively more than nine years of experience in high performance according to the PFG (Polish Federation of Gymnastics) standards. All gymnasts were informed in written and oral way about the assays that would be carried out in the study. All gymnasts signed the informed consent form. Two sequences with the following elements were analysed: round-off - double salto backward tucked performed on the beam (variant I) and round-off - double salto backward tucked during beam dismount (variant II). The highest differences between the key components describing performance of presented exercises exist for joint angles during multiplication and landing position, and resultant velocities during the launching posture and landing position. In variant I the athlete created prerequisites for gliding double salto backward tucked by means of the body segments motions, whereas in variant II he executes faster motions of the body segments accentuating his actions upon backward rotation of the body. In the end of the movement the velocities of the body biolinks and GCM represent the confirmation of controlled motor actions during landing. They have "bunched up" at 1,04 s and 1,10 s in the I and the II variant, respectively with slight "spread" of the body biolinks resultant velocities at the moment of the foot hitting the support during landing. Indices of sports technique key elements in the phase structure of exercises are subjected to development and improvement based on using suggested training programs to enhance the quality of motion control with account for the level of sports fitness, specificity, and complexity of sports exercises. [ABSTRACT FROM AUTHOR]