So I am reaching the point where I would normally like to mix up my work out a bit, just to keep things progressing by not becoming overly adapted to one particular movement. In the past, I have always changed everything in my split accept for my three main compound exercises; squats on leg day, deadlifts on back day and bench on chest day. I figured that they were important exercises and I should always be doing them. I was just wondering if this is wise or should I occasionally change up these three exercises as well?