Hyperextensions

This one works mainly the lower back. The two variations I use are floor and machine. The videos show these. If you are using a machine, you can also explore adding resistance by holding onto weights, wearing a weight vest or some other approach.

Machine Hyperextensions

I find using the machine gives the most control, since you can keep your legs stable during the movement. Not always practical though, since it's not the kind of equipment you keep at home.

Floor Hyperextensions

I often do these simply because there is no machine available. It's annoying that the legs also move, but once you get used to the movement it is possible to minimise that, as this guy demonstrates.