How to grow up the muscles?

Training/ exercise. It is not healthy to use enhancers or androgens (testosterone and alike) to develop muscle definition or enlargement. You may consult with an sport orthopedic specialist for details. There are many otc or "natural" remedies with an androgenic effect. In the long run users of Anabolic steroids or alike will suffer the consequences later in life. Try exercise and training and adequate nutrition.