Ensure the handles are slightly in front of your chest and aligned with the mid chest region.
Push out to a point right before your elbows are fully extended.
Retract back in a controlled manner just prior to the starting position.
Elbows flared at 90 degrees.
Wrists losing alignment with forearms.
Back losing contact with the padding.
Stand straight holding the dumbbells by your sides, palms facing forward.
Bend your elbows until the weight is up to shoulder height.
Slowly lower back to just before full extension and repeat.
Using momentum from the body.
Fully locking out elbows.
Elbows moving around too much.