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The purpose of the task was the assessment of exercise on bone density in underweight, normal weight and overweight young women.The individuals, who participated in our research, which took place at the sport laboratory of the ATEI of Thessaloniki in December 2017, were 31 healthy young girls, 10 of whom were underweight (21,20±0,63 years old),he normal weight were 11 (21,64±1,63 years old), the overweight were 10 (22,7±2,98 years old). Anthropometric measurements (weight, height, waist and hip circumference, range of wrist and elbow) were performed. Body composition via Bioelectric Conductivity (BIA) was assessed with the Bodystat Quadscan 4000, but also by taking skin patches with a Harpenden skinfold caliper. Fitmate indirect calorimetry was used to measure basal resting metabolism. Bone density (BMD), left and right hip and spine evaluation were performed by double energy absorption (DEXA). In the same week of the measurements, blood tests were taken. The nutritional data, which resulted from the 3-day Weighted Food Logbook, was analyzed by using the Food Processor. Regarding the two Physical Activity Calendars and the Physical Activity and Sport Questionnaire, Energy Intake, Energy Expenditure and the Energy Balance were assessed. Statistical analyzes were performed using the SPSS statistical program and were used: a) descriptive characteristics, b) One-Way Anova with the Bonferoni multiple comparison test, c) the Pearson Correlation Index