Good advice.
When training hard you will need breaks now and then. I do this often by just skipping workouts so I'll get 3-4 days of rest.
Rest days should incorporate light activity like going for a walk, light jogging, etc. This is to keep the blood flowing and to calm the CNS (nervous system) to recover. If you look at what the humanoid body is adapted to, it's bouts of hard activity followed by constant light activity.
(LONG RANT, just skip this
I like to use the Neanderthals as examples for BBrs, since they were of equal or a little shorter stature than h. Sapiens, but weighed roughly 20kgs (>40 pounds) more than H. Sapiens. This weight was due to a more compact skeleton (all joints were about twice our size) and more muscle. Neanderthals did crossbreed with early humans on several occasions, and Neanderthal DNA is preserved in some European people very clearly.
OK, I'll stop myself now, cause this can be a long topic.
Suffice it to say, that Neanderthals were like modern humans on hGH & AAS. And some parallels between how they lived and a bodybuilding lifestyle can be drawn.
The point was rest; so take this example;
They went out hunting for big game like mammoths with spear made for thrusting, not throwing since it would be difficult to penetrate their thick skin. So they used a LOT of force. After that they ate meat and relaxed, walking around some in terrain (light activity), and rested until the next round of explosive activity.
Ok, this was a long rant and more than a little beside the point.