I'm sorry but this whole article is horrible . BW routines are fantastic and sure U can build mass doing body weight ... On gear. But the article isn't about anabolics it's simply about body weight. Certainly a natural athlete can get In shape and build muscle and depending slightly on genetics build SOME mass. if your naturally 6,2 and 200 lbs u might have some mass from body weight . If your 5'6 and 145 your never build mass from body weight look at frank madrino ... He goes harder then anyone be routines . He is big or his size certainly ripped but will never be a mass monster . Stating that diet and genetics over focusing on weights or BW is a horrible statement and bro science at it's finest. deit should always be in check , genetics always okay a role but if u wanna gain mass... Lift weights. Absolutely horrible advice I'm sorry