4. You only do isolation workouts
Breaking your training down into chest days, back days, and arm days over-works some muscles and neglects others. It’s an old-school way to train—and it’s incredibly outdated. Most guys still do it, and many make gains for a while, but their progress eventually comes to a halt (usually due to injuries). Body-part routines also prevent your biggest muscles from ever learning to work together in the kinds of coordinated effort you need to lift really heavy weights—another major avenue for fast growth.
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