Stand shoulder width, then hinge and bend to lower yourself down.
Extend the hips and knees to straighten your body.
Slowly lower back down to the start position and repeat.
Rounding the back.
Hyperextending the hips.
Rushing repetitions.
Stand at roughly shoulder width with your feet pointing slightly outwards. Hinge at the hips and bend your knees slightly to lower yourself and grip the dumbbells with both hands.
Start by driving through the heels to extend the hips fully and squeeze your glutes to stand straight. Then lower the weights back down by hinging the hips and bending the knees to about halfway down the shins or until you feel a strong stretch in the hamstrings. Tense your core and maintain square shoulders to keep a straight back throughout. Repeat for the desired amount of repetitions.
Avoid rounding your back or hyperextending when straightening the hips.