The purpose of this research was to investigate the effects of a five-month training program on changes in morphological characteristics in obese and overweight women, taking into account impaired body build-up due to long-term overweight and sedentary lifestyle. Candidates trained in groups of up to six people and the training program was conducted four times a week over a period of five months. There were three 90 minute training sessions per week which included a combination of aerobic training, which featured mainly aerobics, exercises with and without external loads of high number of repetitions, which lasted approximately 75 minutes and corrective exercises from „Pilates“ method with stretching exercises. The fourth training session of the week, which lasted approximately 75 minutes, was mainly an aerobic type in the form of a fast-paced walking on a treadmill with or without inclination or nordic walking. With high attendance and active participation in training, candidates were asked to write a diet diary with a daily calorie reduction, displayed in kilocalories (kcal). The amount of reduction was compliant with a planned weight loss rate calculated individually for each participant. The progression of the training intensity was done according to the average candidate's progress rate within the group, which was evaluated by motor tests and by assessing candidate’s personal experience of effort at the given training intensity. After initial testing was done, testing of motor progress and changes in morphological characteristics were performed once a month. As the motor tests were conducted exclusively for purposes of training planning, this research will be focused on processing, analyzing and interpreting data of measured morphological characteristics only. From a set of variables describing the properties of morphological characteristics, those variables that have pronounced variability regarding to process of weight loss (variables describing volume, body mass and the amount of subcutaneous fat tissue) have been chosen for this study. There are various methods of measuring and evaluating the properties mentioned, and we used a digital weighing scale for measuring body mass, a centimeter bandwidth and a "Harpenden Sklinfold" caliper to measure subcutaneous fat tissue. The results of the research have shown that statistically significant changes in results in all measured variables have occurred.The data obtained suggests that this five month training program with calorie intake reduction is recommended for obese people who want to enter a safe training process and achieve positive results in fighting obesity and reducing the risk of developing diseases caused by obesity and sedentary lifestyle.