The purpose of this study is to determine the relationship between physical fitness and students' academic grades and physical education scores. The type of research conducted was correlational research using a correlation test to determine the relationship between variables, with a sample of 67 students of Senior High School 1 Grabag. The research by taking student physical fitness data using the Nusantara student fitness test (TKPN) and student report card data as a representation of academic scores and physical education scores. The correlation test on the physical fitness variable with academic scores showed a significant result of 0.0001 < 0.05 and had a strong relationship of 0.654 > 0.610. Likewise with the physical fitness correlation test which showed a significant result of 0.0001 < 0.05 and had a strong relationship of 0.621 > 0.610. The results of this study that physical fitness has a positive and strong relationship with academic grades and students' physical education scores. In depth, physical fitness plays a role in increasing brain neuroplasticity through BDNF secretion that optimizes cognitive function, as well as increasing cardiorespiratory capacity that supports movement efficiency and emotion regulation. In conclusion, physical fitness is a crucial internal instrument that directly and indirectly supports students' learning achievement holistically through physical, cognitive, and psychological readiness.
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