How come almost no gym rats these days can spot a lift properly? I'm not talking the 18 year olds with flat baseball caps at a jaunty angle, serious juicers and vets of the iron.
They either wait until you're pinned before nonchalantly placing one hand on the bar or else, for the bench press for example, upright row the weight from the first rep thus completely removing any tension and skewing your normal numbers.
How fucking hard is it? Let the person lift til you see signs of struggle, hover hand when you can see the reps getting shaky, fingers under bar when the concentric reps lose momentum and lift and rack when they hit complete failure.
Gyms are full of retards now.