Against a 10-minute running clock, complete:
then, with the remaining time, AMRAP Squat cleans (225/155)
Score: Squat Cleans
If you have never failed a rep on a heavy day, you are missing out on training.
If you fail 3 out of 5 attempts on a heavy day, you are missing out on training.
The same is true for Met-Con days, if you have never failed a muscle-up or a clean because you have paced the workout too well, you don't know where your threshold really is.
If you start going into your workouts with a practice mentality, where it's okay to fail a rep, and not be perfect you will learn so much about yourself and your movement.