Gestational diabetes mellitus is increasing in parallel with overweight and obesity in the obstetric population, yet evidence on effective approaches to prevent GDM is lacking.A recent randomized controlled trial aimed at modifying nutrition, weight gain, and physical activity in obese pregnant women was not effective in increasing physical activity. Base on successful trials in the nonpregnant population we aimed to assess the feasibility of individualized, goal-directed exercise intervention in obese pregnant women. Feasibility issues that we address here include implementing the intervention and assessing the efficacy and accept ability of the intervention.