The research aimed to identify the effect of using cluster group training on the outputs of rebound force (jump height - flight time - ground time - RSI), the speed and electrical stimulation strength of some lower limb muscles operating in the start for swimmers, and the researcher used the experimental approach on a sample of (24 A swimmer for the age group (16-17) years divided into two groups .The research tools include: - Deep jump test - GoPro HERO5 Black digital video machine with frequency (240 cad / second) - Kinovea program - Electromyography (EMG) device brand Mega 6000 - Training Program. SPSS in order to obtain: Arithmetic Mean, Standard derivation, T-test and Sekwness, Correlation coefficient, Rat of Improvement. Mainresults: Training with cluster groups positively affects the development of retractable force outputs (rebound force index - jump height - grounding time - flight time. Training in cluster groups positively affects the development of the speed and power of electrical stimulation of the initially working muscles of swimmers. Training in cluster groups achieves higher rates of improvement in terms of performance related to explosive action compared to traditional training. Improving the biodynamics of the muscular action of the working muscles results in the development of the explosive action outputs of these muscles. Keywors: Cluster Training, biodynamics.