Use of anabolic androgenic steroids is very common amongst athletes, to improve sports performance by: • increasing muscle size, strength and power • harder and longer training • increasing aggression and competitiveness The androgenic effects of anabolic steroids (increased aggression and competitiveness) help the athletes / body builders to train harder and to recover more quickly, resulting in increased strength. However, there is little medical evidence to support this belief that use of anabolic steroids alone can increase muscle strength in adult males. The truth being that muscle development is dependent on an appropriate diet and exercise program.