| Summary: | Plyometry is a training method designed to reproduce fast explosive and powerful movements, it improves strength and speed in different muscle planes, which is why it is usually very useful to improve certain physical skills in sports such as soccer. The objective of this research is to theoretically validate, through consultation with specialists, a group of plyometric strength-reactive exercises for U-14 soccer players. This is a qualitative and correlational descriptive-explanatory research. Twenty-one soccer specialists classified into two independent groups were surveyed, theoretically validating the scope and limitations of a plyometric exercises proposal for lower limbs adapted to U-14 soccer players. The averages that describe the scores achieved were higher in the post-test, with significant differences when evaluating each group studied (Group 1: “I” r=0.004, “A” r=0.005, “P” r=0.003, “ V ”r=0.003 and“ EP ”r=0.003; Group 2:“ I ”r=0.002,“ A”r=0.003,“ P ”r=0.001,“ V ”r=0.003 and“ EP ”r=0.002), there is not significant differences when comparing the results between each independent group as part of the pretest "I" (p = 0.973), "A" (p = 0.756), "P" (p = 0.426), "V" (p = 1.000) and “EP” (p = 0.468), and as part of the post-test “I” (p = 0.223), “A” (p = 0.973), “P” (p = 0.173), “V” (p = 0.918) and "EP" (p = 0.918). With this work, the intervention proposal is theoretically improved, concerning 25 plyometric exercises applied to lower limbs of U-14 soccer players, in addition, five analysis indicators are taken into account. It is recommended to carry out a practical validation that focuses future research, with a type of experimental or quasi-experimental research.
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