What Arnold did wasn't magic; it was employing good old-fashioned supersets and techniques like running-the-rack to achieve his legendary physique. "Training right in front of the dumbbell rack was a favorite of mine," he says, "I would pick an exercise and shock it by running the rack, which can make for a brutal extended set." Superset that with seated cable rows, and you'll leave your muscles screaming.
Keep cruising on your cardio! This means you're still running 1-2 miles 3-5 times this week! Space your runs out so you don't have to run for too many days in a row. If you skip cardio, you'll be making up for it later!