Your body naturally uses certain muscles when your pulling weight, and vis versa when pushing weight.
Think about it. Bench pressing uses tri's chest, delts, abs. Deadlifts use bi's, lower back, legs, forearms, trapz.
Let this be ur guide as to which muscles to train w/ eachother and which days to do them. Bottom line, the human body has 1000's of years of experience, you've prolly been liftin for just a few or more. Your body knows more than you think.
Just a thought.