With dumbbells in each hand hinge forward as far as possible.
Bring the dumbbells towards your lower chest in a straight motion.
Slowly retract back to the start position and repeat.
Using excessive momentum.
Rounding the back.
Pulling towards your neck.
Holding a dumbbell lay down on a bench with your head at the end of the bench.
With a slight bend in the arms, lower the dumbbell back in an arc motion.
Lower until you feel a stretch in the lats then pull it back to the same arc to be over your chin.
Having an inconsistent bend in the elbows.
Going too far past a strong stretch.
Rushing repetitions.