The best strategy for management of obese, outside pharmacological interventions, is physical exercise associated to diet. Recent research has discovered that the problem of obesity is largely due to a biological clock and that lipid oxidation is higher in the evening compared to the morning and at night compared to day. The purpose of this study is to investigate the effect of time-of-day specific obese training on body composition and physical capacity in obese following a low calorie diet. 20 sedentary pre-obese and obese with a mean BMI of 34.3 kg/m2 aged 20 to 47 years subjects participated in a concurrent strength and specific endurance training for obese. Subjects were divided into two training groups: a Morning training Group (MG: n= 10) and an Evening training Group (EG: n= 10). The specific training associated to lower caloric diet has increased physical capacity (17, 7% for EG and 15, 6% for MG), decreased body weight (7, 3% for EG and 6% for MG) fat percentage (19, 5% for EG and 11, 3% for MG) and waist circumference (10, 2% for EG and 8, 2% for MG) in both groups. Afternoon training was more effective than morning training on fat loss (24.9% for EG versus 15.9% for MG) and on lean mass variation (+ 2.9% for EG versus-0.5% for MG).