If you're bored, it's akin to your nervous system shouting, "Hey buddy, I'm ready for a new challenge. It's time to move on!" In general, the rate of adaptation determines the length of a program, and it differs among individuals. To determine the duration of a program, one must make progress (either 1-2% increase in load or a 1-2 rep increase) each workout. Beginners will make progress for a longer period of time; advanced trainees will stagnate much earlier.
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