Not bad. You are starting with your elbows a little too high. Your back goes through mild waves of extension and flexion as you descend. Drop your elbows a little and get tighter. Don't work to arch your back. Just stand up as normally as possible and don't let anything move as you descend. Tighten down around your held breath. Keep your chin down.
Where do you train that has all that Eleiko kilo iron?