About 20 years ago, the Beta-2 andrenoceptor became legendary virtually overnight when bodybuilders began to notice the incredible effects certain asthma drugs had on developing lean muscle and burning bodyfat… In short, this receptor, when activated, can increase cAMP, which activates Akt signaling, which results in decreased muscle catabolism by decreasing expression of various muscle specific ubiquitin protein ligases (e.g., atrogin-1/MAFbx), which are thought to be responsible for muscle protein degradation... Furthermore, working through cAMP and non-cAMP mediated mechanisms, ultimately results in increased activation of mammalian target of rapamycin (mTOR) signaling... In a nutshell, it can potentially prevent muscle from breaking down, while also increasing muscle size