The purpose of this study is to investigate how low intensity aerobic exercise effects PPAR-γ and DCP2 mRNA gene expression exercise for pregnant women. 7 week old ICR mice, male(n-10), female(n=50), supplied by BIOKOREA were used in this study. After hybridization, pregnant mice were categorized into 2 groups depending on exercise; “non-exercise” group(n=20), “low-exercise” group(n=20). A series of genetic tests were performed to identify PPAR-γ and DCP2 mRNA gene expression producing the following results. The statistical changes were noted for PPAR-γ expression within muscle tissue when comparing the following groups; the “non-exercise” group and “exercise” group(p<.05). The expression of PPAR-γ among the groups was according to low intensity aerobic exercise. The expression of DCP2 mRNA among the grlow intensity aerobic exercise group is much higher than non-exercise group(p<.05). Therefore, it brings positive changes in sensitivity on glycometabolism and blood insulin, effectiveness of metabolism, oxidation of fat which also shows that the increase in UCP2 mRNA was proven when low intensity aerobic exercises was done. If the point is increasing UCP2 mRNA more effectively on energy metabolism, low intensity aerobic exercise will have a bigger impact on energy metabolism. Also, in terms of exercise prescription it is better to focus on quantity than intensity in order to grasp more on energy consumption with respect to the fetus.