SARMs is a new class of performance enhancing compounds that are shaking up the fitness industry with the ability to promote muscle growth, fat loss, and even cardiovascular endurance. In order to maintain legitimacy, these new compounds marketed for research purposes are emerging as a promising alternative to anabolic steroids Many people in order to promote the physical structure of SARM happened great changes As the growth of the age, the quality of our strength and skeletal muscle endurance will decline because of the type 2 fibers gradually disappear This severely limit our individual performance This partial androgen deficiency in the crowd, the use of SARM, skeletal muscle quality of muscle strength will increase significantly.