Place hands just wider than shoulder width in line with the shoulders with feet on a bench.
Push through your hands extending your elbows.
Bend the elbows lowering yourself until your chest almost touches the ground and repeat.
Flaring the elbows out at 90 degrees.
Arching you glutes upwards.
Dropping back and shoulders down too low.
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.