The amylased object were healthy basketball players (22 - 26) and triathlonists (19 - 20) making jumps in different ways: CMJ - vertical jump with shockproof sit up (per crooked knee up to 90º); DJ – vertical jump from 40 cm platform (sit up to 90º); SJ – vertical jump from a static starting position (sit up to 90º). Research timing: November – December (2004) and March (2006). The variability of movement by making vertical jumps in different ways is the main point of this study. To measure the level of spring the contact platform was used. It was connected with the electronic meter of spring that measured spring’s height and take–off time. Sportsmens springs results were recorded into the individual springs protocol. Using the methods of statistical mathematics the results of research were treated. Main tasks: determinate variability of jumps before and after strain, also determinate feetback information and compare variability of movement during this tests. The thirst 5 jumps made were better at the beginning than at the end. The difference is unreliable (accordingly CMJ – 38.4 ± 1.4 and 38.3 ± 1.4 cm.; DJ – 38.6 �� 1.5 and 37.0 ± 1.3 cm.; SJ – 37.6 ± 1.2 and 36.4 ± 1.1 cm., p>0.05). After 10 jumps (with/without feetback information) before strain were: best in SJ (according 18.9 ± 0.7 and 18.8 ± 2.0 cm, p>0.05), worst DJ (according to feetback information 20.7 ± 2.8 and without it – 21.7 ± 2.2 cm.., p>0.05). After 50 jumps sportsmen made 10 jumps without feetback... [to full text]