ffknight84 said:why does everyone do back and bis, arg!!! youre back has 3 large muscle groups in it, traps lats and erectors, they are a day by themselves. do bis with shoulders since you dont do much volume for shoulders you have plenty of energy for bis. just my 2 cents
It's a popular combination due to the fact that your bi's generally get worked while working back.
Same reason many people prefer to work chest and tir's together.
Both options fit the "Once a Week per Muscle Group" routine very well.
.02,
Joker