THIS IS NOT TRUE
It is commonly assumed that if you train your legs you will also stimulate growth of your upper body muscles, as training legs will increase anabolic hormones in your blood circulation. The latter part may be true, but this effect is only very short. Therefore, the relatively short increase in hormone levels after a leg workout will not be sufficient to stimulate muscle growth in your upper body.
In addition, what is important to know is that muscle growth is a very local process. So, if you want to grow your upper body muscles, you really have to train them directly. The same counts for your legs. No excuses!
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