I just thought you were saying that the three full body routines should be different and I didn’t know why that should necessarily be the case.[/quote]
Lets purposely polarize the question…
Should the OP do the same workout all three days?
I believe most would say no even though a lot of beginners designing their own workout do just that. The “pros” of such a routine would be quicker results on the movements you are using. The “cons” would be faster plateaus and a stale routine.
Should the OP do 2 different workouts alternating days?
As you have pointed out plenty of programs are designed this way. Similar “pros” and “Cons” with slower results due to a larger variety of movements but also slower to plateau or get bored.
Should the OP do 3 different workouts rotating days?
Similar “pros” and “Cons” with slower results due to a larger variety of movements but also slower to plateau or get bored.
So where does it end? I have no idea. I think a lot of programs for beginners are designed with a balance of results and boredom in mind. That is to say people that don’t see results will quit but so will people that get bored so the most successful programs balance the two. Whether that balance is best achieved through 2 or 3 rotating workouts… who knows. Probably depends on the person.