How common is this?
I was standing military pressing in the rack today and I could barely budge a weight I knew I was good for 5 reps with. I thought it might be fatigue (I did two sets of 20 militaries on Thursday) but later in my session I grabbed the fixed weight barbells and did 20 easy reps of 70. I loaded 65 up on the oly and could only get 12.
I went to the counter to ask how much the olympic bar weighed but as soon as I mentioned the plates the woman said 'oh, some of our plates are off by as much as seven pounds. We had to weigh them once for a beginner class to make sure everyone was moving the same weight.'
To which I blinked and said 'so when I deadlift 365 with six plates and change I could be actually trying to move a lot more' and she said 'Yes. Sorry about that.'
Gah. Dumbells don't lie as often. Not much I can do about deadlift or squatting, though. This could explain why sometimes the bar is noticably unbalanced towards one end despite me being perfectly in the middle...