The study determines the long-term effect of exercise on osteoporotic fracture risk. Since actually no controlled supervised exercise study exceeds the time frame of 4 years, knowledge concerning the long-term effect of exercise on fractures and fracture-risk factors is scarce. Within the Erlanger Fitness and Osteoporosis Study (EFOPS, an ongoing controlled exercise study with currently 16 years of supervised exercise with 45-50 osteopenic, early-postmenopausal women in exercise and sedentary control group each, the investigators therefore focus on overall-fractures, Bone Mineral Density and falls.