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This study aims to analyze the effect of body angle variations on propulsion force, drag coefficient, and freestyle swimming performance using a biomechanical approach. The background of the study is based on the importance of movement efficiency in swimming which greatly affects athlete performance. The research method used a quantitative experimental design involving university or club level swimmers who have a minimum of three years of training experience. Subjects were selected through purposive sampling with the criteria of being healthy, accustomed to using freestyle techniques, and willing to follow the research procedure. The instruments used included 3D motion capture to record body angles and movement coordination, force sensors to measure propulsion force and drag coefficient, and a time recording system to calculate average speed. The research procedure was carried out by providing variations in body angles of 0°, 15°, and 30°, each with three replications. The data obtained were analyzed using descriptive statistics to describe the average, standard deviation, and data distribution, as well as comparative statistics (ANOVA or paired t-test) to compare performance between angle variations. The results showed that a 15° body angle provided optimal performance, characterized by increased average speed and propulsive efficiency compared to 0° and 30° body angles. These findings confirm that body angle regulation is a key factor in reducing water resistance and increasing propulsive effectiveness. The discussion of the results indicates that applying biomechanical analysis to swimming training can provide objective information for developing training techniques and strategies. Therefore, this study concludes that a 15° body angle is the most ideal position for improving freestyle swimming performance. Further research is recommended to expand the number of subjects, explore variations in other swimming styles, and integrate physiological data to obtain a more comprehensive picture.

This study aims to analyze the effect of body angle variations on propulsion force, drag coefficient, and freestyle swimming performance using a biomechanical approach. Movement efficiency in swimming plays a crucial role in improving athlete performance. This study employed a quantitative experimental design with university or club-level swimmers with at least three years of training experience as subjects. Subjects were selected through purposive sampling with the criteria of being healthy, familiar with freestyle techniques, and willing to follow the research procedures. The instruments used included 3D motion capture to record body angles and movement coordination, force sensors to measure propulsion force and drag coefficient, and a timekeeping system to calculate average speed. The body angle variations tested were 0°, 15°, and 30°, each with three replications. Data were analyzed using descriptive statistics to describe the mean, standard deviation, and data distribution, and comparative statistics (ANOVA or paired t-test) to compare performance between angle variations. The results showed that a 15° body angle provided optimal performance, with increased average speed and propulsion efficiency compared to 0° and 30° body angles. These findings confirm that body angle regulation plays a crucial role in reducing water resistance and increasing propulsion. The study concluded that a 15° body angle is the ideal position for improving freestyle swimming performance. Further research is recommended to expand the number of subjects, explore variations in other swimming strokes, and integrate physiological data for more comprehensive results.

To improve public health, the problem of providing clean water must be a top priority. Since water is essential for all living things, water is also very important. It requires the availability of healthy water, which includes monitoring and regulating water quality to meet human needs and life. The goal is to ensure that everyone has access to healthy drinking and clean water. Target. The aim of this research is to find out whether there are coliforms and fecal coliforms in the drilled well located on Rt 28/Rw 007, Baguala District, Ambon City. Methodology. This research is classified as descriptive research. The 6 water samples used were taken at Rt 28/Rw 007 Baguala District, Ambon City. The total population in this research is six drilled wells. All drilled well water was taken at 1 Rt/Rw and used as the resulting sample. The research results showed that fecal coliform and coli bacteria were found in drilled well water at Rt 28/Rw 007 Waiheru Perumnas Village, Baguala District, Ambon City; three drilled well water was positive for coliform bacteria, and one drilled well water was negative. Five positive borehole water also had negative coliform bacteria. Decision: According to the Republic of Indonesia Minister of Health Regulation number 32 of 2017 concerning environmental health quality standards and water health requirements for sanitation hygiene purposes, swimming pools, aqua solutions and public baths, the number of coliform bacteria is 1 and the number of coliforms is 3.

Swimming pool water is water used for sports and its quality meets health requirements. To find out the number of Escherichia coli bacteria identified in the adult public swimming pool water at the Ambon State Polytechnic. This type of research is descriptive research located at the Ambon State Polytechnic. The population in this study is swimming pool water and the samples taken were 2 samples from an adult swimming pool and 2 samples from a children's swimming pool. The research results showed that the results of examination of 3 swimming pool water samples did not contain Escherichia coli bacteria and 1 swimming pool water sample contained Escherichia coli bacteria, and for Coliform bacteria there were 2 positive samples and 2 negative samples containing Coliform bacteria.  Based on the results of research conducted at the Ambon Class II BTKL PP Biology Laboratory, it can be concluded that of the 4 swimming pool water samples taken from public swimming pool water at the Ambon State Polytechnic, there were 3 negative samples and 1 positive sample containing Escherichia coli bacteria, and for bacteria There were 2 positive samples for coliform and 2 negative samples containing coliform bacteria