Final point to add, as your doing sports training bodybuilding type rotines are not the best for you. You need isometrics/plyometrics in your program as well.
To see how diffrent a sports spesific routine looks to your regular bodybuilding routine take a look at this....
Now both methods are good, one makes you big the other makes you better for a sport. they all have there aplications but for rugby you need to go for more of a sports spesific program.
Its in french but dont hold that against it, its very easy to understand the cheese eaters in this one...
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