D2. Training split stress
Hop back above the funnel. In previous sections, I said training pours “liquid” into the funnel. But now the liquid has more characteristics. There's color, color intensity, and size of pour. Meaning every exercise you do is a mixture of “color” and “volume.”
So, when you train, two things happen.
First, there's the crashing (and the turbulence) of the liquid as it goes into the funnel.
Bigger pours cause bigger ripples and bigger waves. Meaning global exercises make the funnel a more hectic place.
Second, the liquid in the funnel changes colors.
So when you do a fuller body training program, dropping every color imaginable into the funnel, the color turns into a blackish-brownish mixture. You don't know what's responsible for the fatigue. It’s a bunch of colors crashing around sloppily. It’s poopy mayhem.
Compare this to, say, a “biceps day” where you only train biceps. There's only one color of the water in the funnel, so you know what's causing the fatigue. And this reality holds even if you're using a bunch of global exercises. The water might be thrashing, but it's still the same color.
Alas, chances are, using a split routine, it won't be thrashing like it would be during a full body routine. Because you're automatically eliminating some of the most stressful exercises.
When you train “chest,” you won't be doing squats or deadlifts.
The bench press checks in at about 30% MU recruitment. Even if you train the bench press maximally, you're still not digging as deep of a global stress hole as you would with something like a deadlift, which is about 70% MU recruitment.
So full body training programs are tough not only because you're training the entire body, but also because you're constantly using exercises that allow for high MU recruitment.