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 with feet hip-width apart, holding the dumbbell in a goblet grip.
Step sideways, bending knee to 90 degrees, keeping other leg straight.
Extend to return back to the start position and repeat.
Knee angling out or in too far.
Foot angling out or in too far
Bending the back.
Hang from the bar with an overhand grip, spaced just wider than shoulder width.
Bring your legs up to be level with the hips.
Slowly lower back to the start position and repeat.
Swinging around.
Using momentum to kick legs up.
Dropping on the way down.