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That principle fits, when training you have to make progressions and move up a weight level or increase your reps, or you plateau and don't see as many improvem
by nicholassmith 13y ago
That principle fits, when training you have to make progressions and move up a weight level or increase your reps, or you plateau and don't see as many improvements. I imagine it's similar for 'mental muscles', you'll need to push your boundaries to build your levels.