Hang from the bar with an overhand grip, spaced just wider than shoulder width.
Pull up by brining your elbows to the back of the hips until chin is level with bar.
Slowly lower back to start position and repeat.
Swinging to get up.
Dropping on the way down.
Uneven grip.
Keep back against support, press evenly. Mistakes: Overarching back, uneven press.
Lift to shoulder height, control the descent. Mistakes: Swinging weights, lifting too high.