The habit of consuming fast food and exceeding the needs of his body impact on fat accumulation in the stomach. Excess abdominal fat is a risk factor for the development of heart disease and other obesity-related diseases. The way to reduce abdominal circumference is to exercise, one exercise that can be done is by aerobic and bicycle crunch exercise. This research is to know the effect of giving aerobic and bicycle crunch exercise to reduce abdominal circumference. This research type is pre exsperiment. This research was conducted with pre and post test approach with one group pretest-posttest design. Sampling technique using purposive sampling consisted of 30 sample. Interventions were done in 6 weeks with frequency of 3 times of exercise in a week. Measurement pretest and posttest using meterline. Normality test using Shapiro Wilk Test, effect test using Wilcoxon Test. Based on the result of the treatment that has been done by researcher, the result obtained that aerobic and bicycle crunch exercise effect on the decrease of abdominal circumference. Statistical test for test effect aerobic and bicycle crunch exercise used Wilcoxon P = 0,000(<0,05). From these result, it can be concluded aerobic and bicycle crunch exercise can decrease abdominal circumference
