If you train the smaller muscles first (biceps in the case of back, triceps in the case of chest) they will be pre fatigued and not assist the larger muscles as effectively, resulting in the larger muscles not getting the workout they need.
Sure, the bis and tris will get a great workout but the larger muscles will not.
Basically, you should do them in reverse (back then bis or chest then tris).



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why would you do bis first????


