Abstract
Purpose. The study’s goal was to determine the relationship between fat percentage and muscle and cardiovascular fitness, as well as the effect of the circuit body weight training method on muscle and cardiovascular fitness.
Methods. Fitness requires effective and efficient methods, one of which is the circuit body weight training method. Some women’s perspectives on weight training have not been prioritized; there is still a lack of understanding on the regulation of exercise doses; and inconsistent studies of the relationship between fat percentage and physical fitness need seeking out the most recent data. A sample of 20 adult women aged 30-50 years was employed in this correlational and experimental study. The instruments used are a hand grip dynamometer, a leg and hand dynamometer, a rockpot, and an Omron body fat monitor. Techniques for collecting data from tests and measurements. The Spearman Rho test was used to analyze the data, along with Wilcoxon which assisted by SPSS 23.
Results. The correlation results revealed a significant relationship between body fat percentage and hand, leg, back, and cardiovascular fitness, with a sig value of 0.05. The comparison revealed significant differences in pretest and posttest percentage of fat, back muscle fitness, limbs, and cardiovascular with a sig 0.05, but not in hand squeeze. It was determined that as the percentage of fat in the body decreased, fitness increased and vice versa. Circuit body weight training boosts cardiovascular fitness, lowers body fat percentage, and improves muscle fitness.
Conclusions. Even though the power of hand squeezing is insignificant, it produces positive results. It is hoped that this study will provide information and a better understanding of weight training. The research is limited to adult women, the sample size is small, and there is no control group. This study can be improved through additional research.

Keywords
circuit body weight training, fat percentage, muscle and cardiovascular fitness, adult women