Though I hate to google articles, here is a "Dummies" guide to the body adapting to a certain routine after 6 workouts...
The Borg Principle
Anybody who's ever watched the newer versions of "Star Trek" knows about the Borg. They're the bad-ass creatures who can't be beaten using conventional methods. Blast them or their ship with phasers, and they adapt. The only way to keep them off balance is to set your weapons on a constantly shifting frequency so they can't adapt.
Well, your body is the Borg. It's designed to adapt. When you keep doing the same exercises in the same order, for the same amount of reps, using the same hand grip or foot stance, the body adapts. In effect, the nervous system becomes ""hardwired" to that particular routine and consequently, fewer muscle fibers are recruited, less energy is used, and fewer demands in general are made on the body. You become an expert at that routine, and after a surprisingly short time, you stop making progress.
If, however, you keep shaking things up, "changing the frequency," so to speak, the nervous system does not adapt. Instead, what happens is that the body—the muscles—grow stronger and bigger to survive the onslaught of your attack. Research (by Poliquin and others) shows that, in most cases, the body begins to adapt after having performed a particular routine 6 times. After that, it's time to shake things up again.
Yes, to the Borg, resistance if futile, but in weight training, resistance to becoming stale is mandatory.
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