Stand straight with a slight bend in the knees.
Hinge forwards, where the weights go down to your mid shins.
Hinge back upwards to the start position.
Arching the back.
Bending the knees too far forward.
Rushing repetitions.
Grip the bar at shoulder width and hinge forwards as far as possible.
Bring the bar 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.