Background: Injectable contraceptives stimulate appetite, increase weight, and can cause menstrual irregularities, including missed periods for three consecutive months, menorrhagia, and spotting. Several factors can contribute to weight gain, including an unhealthy lifestyle. Weight control involves maintaining food intake, rest patterns, and activity patterns through exercise, including physical activity such as sports or aerobics. The purpose of this study was to determine the effect of low-impact aerobic exercise on weight loss in 3-month injectable contraceptive acceptors in the Baureno Health Cente r work area. Metode: This research design used one group pretest posttest design. In this design there is only one group, the initial test (Pretest) and the last is given a final test (Posttest), The population women used progestin in injection in the Baureno Health Center East Java Indonesia work area is 18 people, the measuring instrument to identify weight loss using a digital scale. In this study, low impact aerobic exercise was done for 30 minutes twice a week for 8 weeks. Results: most of them were 49.0-58.0 kg, 10 respondents (55.6%), while almost half of them had a body weight of 60.0-69.3 kg, 7 respondents (38.9%) and a small number of respondents with a body weight of >70 kg, only 1 respondent (5.1%). of this study using statistical tests with Paired T-Test with a value of ρ value = 0.000 <α = 0.05 indicate that there is an effect of the implementation of low impact aerobic exercise on the weight progestin only contraception women Conclusion: There is an effect of low impact aerobic exercise on weigh loss in progestin only contraception women. Low impact aerobic exercise can be an alternative to manage weight in 3-month injection KB acceptors. Therefore, it is necessary to hold routine weekly exercise activities.