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Fish smoking is one of fish preservation methods. Fish smoking process use corn cobs as fuel. Continuous smoke exposure and inhalation can cause a decrease in lung function in workers. One of the activities that can be done to improve respiratory efficiency is practicing modified low impact aerobic exercise. The aim of the study was to analyze the effect of the implementation of modified low impact aerobic exercise. The research was a quantitative research with quasi-experimental method using two-factor completely randomized design. The experiment was conducted by categorizing the sample into four groups: group I was treated by 1-week modified low impact aerobic exercises, group II acted as the control for group I, group III was treated by 2-week modified low impact aerobic exercises, and group IV acted as the control for group III. Each group consisted of 24 samples. The levels of respiratory efficiency were measured before and after 1-week treatment for Group I and II and 2-week treatment for Group III and IV. The result shows that the measurement of Vital Capacity FEV 1 for group 1 that conducted 1-week low impact aerobic exercises showed an increase of 9.63% and group 2 that conducted 2-week low impact aerobic exercises showed an increase of 9.25%. While the measurement of Vital Capacity FEV1/FVC for group 1 that conducted 1-week low impact aerobic exercises showed an increase of 5.75% and group 2 that conducted 2-week low impact aerobic exercises showed an increase of 17.5%. The result of General Linear Model shows that there is a correlation between the exercise using modified low impact aerobics to the levels of respiratory efficiency with p-value 0,003 (α<0,05).