My fault, I didn't answer your question about the logic. I like the hit bi's on chest day, and tri's on back day, because If I do it otherwise I can't hit them as hard. The core lifts fatigue the muscles to where I can't hit them as hard as I could if I were to do them on differant days.

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Stats
Height: 6'1"
Weight:192lbs
Fat%: about 19%