RQ 1: What is the effect of different strength training regimes on bone health among persons with ED? RQ 2: What is the effect of different strength training regimes on body composition, hormone levels, muscle strength and power among persons with ED? RQ 3: What is the effect of different strength training regimes on ED psychopathology, body awareness and quality of life among persons with ED? RQ 4: What is the effect of different strength training regimes on weekly physical activity, motives for physical activity and compulsive exercise among persons with ED? RQ 5: What is the immediate effect of different strength training regimes on blood pressure among persons with ED? RQ 6: How do persons with ED experience the use of strength training as part of treatment for ED? RQ 7: What is the long-term effect of different strength training regimes on bone health among persons with ED? RQ 8: What is the long-term effect of different strength training regimes on body composition, hormone levels, muscle strength and power among persons with ED? RQ 9: What is the long-term effect of different strength training regimes on ED psychopathology, body awareness and quality of life among persons with ED? RQ 10: What is the long-term effect of different strength training regimes on weekly physical activity, motives for physical activity and compulsive exercise among persons with ED?