Preparing gymnasts is more severe due to more frequent change of code points, the major role in preparing athletes taking him coach, he was forced constantly to find the best means of improving working methods. Of all the biomotric training qualities, strength and power are the most crit cal for many sports. Sports with speed-power dominance is based on developing solid strength and power. Understanding the mechanics and physics of force training and incorporate their principles workout will boost the competitiveness of athletes. Aim: Plyometric exercises performed at the floor and beam lead the level of explosive power and increase the technical level of artistic jumps. Methods: Evolution of subjects was accomplished by the Kinovea program, the data being presented in tables and graphs. The means used for research are specific for pliometric training adapted to gymnastics discipline and to the physical characteristics of the individuals targeted. The research was conducted on two groups (experimental and control group) of 8 gymnasts of 9-10 years old. Results: Explosive power increases the experimental group compared to the control group at all tests (p<0,005) Conclusion: The results lead to the conclusion that plyometric exercise induces an elastic mechanical adjustment in the opposite direction, an increase of muscle tone. Plyometric training interaction causes a change in elasticity-contractility of the muscle by requesting the cycle: stretch - explosive force.
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