Ideally, you’d check these three items before starting your work sets, but at the very least, be sure to check them when things are harder than expected. You might be surprised how often one of these three errors is the culprit.
#4: What if #1, 2, and 3 aren’t the problem?
In this case, check the calendar. If the day of the week ends in the letter “y,” then you simply move on and do the next set.
It’s challenging and it’s hard, but then again, it’s supposed to be hard. This is how you make progress.
In Mark Rippetoe’s words, “Easy doesn’t work.”
It will still be hard two months from now - your 205 lb squat in a month or two will be about as hard as your 135 lb squat was today, but because you can now squat 205 lb, your old 135 lb squat is now just an easy warm-up because You. Got. Stronger.