This movement should be performed in a seated position, preferably with back
support. Grasp a barbell and raise it to your upper chest. Use an underhand grip,
supporting the bar from underneath. Your grip should be shoulder width.
Press the barbell straight up, stopping right before your elbows would lock
out.
Hold for 1-2 seconds, then release back to the starting position on the upper part
of your chest.
Tips
Try to keep your elbows slightly forward in this movement.