Back Extensions / Hyperextensions have been covered quite a bit here on ATG.
A favorite among lifters who also often mention in Interviews when it comes to lower back health and recovery.
Below is a video of how Oleksiy Torokhtiy likes to perform them.
More: Watch Dmitry Klokov’s Hyperextensions with 80kg here.
Translation / Summary: from Sergiy.
He never uses more than 20 kg. Goes up fast, pauses, goes down slowly.
He also mentions that he goes side to side at the end without weight (you can see it in the video).