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Bodyweight vs. arm size
I must admit I hadn't heard that one before. No matter, here's the deal: Yes, genetics is a factor for arms - as with pretty much any aspect of bodybuilding. Some guys can pack on a lot of mass quickly, but may also pack on the fat as easily, while others can eat tons and still not gain an ounce. The former would be an endomorph and the latter would be an ectomorph. An ectomorph will have problems putting on weight regardless, but it's true that it is easier to do so if you're on a bulk diet (which should cause overall weight gain - at least in theory.) So, in a limited sense, muscle gains are easier to come by in conjunction with overall weight gain.
That said, that rule about arms not growing X inches unless you put on Y pounds has the distinct smell of old-school gym myth. Add 15 lbs of bodyweight = 1 inch arm increase? Does that apply to a guy who gains 14 lbs of fat and 1 lb muscle, or 14 lbs of muscle and lb of fat? And what if the starting weight is a chubby 300 lbs with 20-inch arms that mostly consist of flab? Or... Well, I think you see what I'm getting at. The bottom line: If you train your arms with sufficient weight and intensity, followed by adequate rest and nutrition, your arms will eventually grow, period. Progress may be painfully slow for an ectomorph, and the daily struggle of getting enough calories can be tough, but it can be done - and there is no set number of additional pounds of bodyweight you have to put on to get there. Hope that helps!
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