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Purposes: The research aimed to study and compare effects of agility training program with increasing
intensity affecting speed and leg muscle strength of Thai boxing athletes between Experimental Group and
Research Methodology: It is Quasi Experimental Research. The samples passed the group selection
criteria which were Thai male boxing athletes in developing level aged 18-22 years in Thailand National
Sports University, Phetchabun Campus having Thai boxing competition experiences at least 3 years and
being in practicing period and not being in Thai boxing competition schedule. Purposive random sampling
was implemented at least 14 people dividing into 2 groups with 7 people per each group. The sampling
was from drawing lots dividing into Experimental Group and Control Group practicing for 6 weeks using
Illinois agility test and Back and Leg dynamometer. The data was compared the average of agility and leg
muscle strength. It was found that the data was compared between the control group and the
experimental group were t-test independent, the significance level .05.
Findings: It was found that referring to agility test before and after of experimental group with agility training
program with increasing intensity of Thai boxing athletes, before training the agility was as 17. 1 ± 1. 33
seconds and after 6 weeks of training the agility was as 15.10 ± 1.51 seconds. The agility was better after
6 weeks of training. Besides, before training leg muscle strength test was as 2.163 ± 0.35 Kilograms/body
weight and after training leg muscle strength was as 2. 83 ± 0. 20 Kilograms/body weight. Leg muscle
strength was better after 6 weeks training. It was shown that after 6 weeks training agility and leg muscle
strength were better with Statistical Significance as .05
Conclusion: It was concluded that agility training program with increasing intensity affecting agility and leg
muscle strength could increase agility and leg muscle strength of Thai boxing athletes, Faculty of Education,
Thailand National Sports University, Phetchabun Campus.
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