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I’ve been lifting weights long enough that I’m confident knowing when I have another rep or two, or three, left in me (i.e., “reps in reserve” or “reps in the tank,” as it’s known) when performing a set of an exercise. But I can still be wrong.
Like that time a few months ago when I got stapled by my attempted 10th rep on a set of close-grip bench presses. Rep nine came up strong and smooth and I was certain I would get the 10th. Once it came off my chest it immediately grinded to a halt, and then gravity did its thing. (I had safety bars in place so the barbell rested on them and I could easily squirm my way to freedom. Use safety bars when training alone!)