I just started going to a new gym which has hip abducter/adducter machines. (And not a single ab-crunch bench that I can use; apparently only 6-foot-tall people need to do crunches? Oh well, I can do 'em on the floor mat like some sort of pre-technological cavewoman.) That's really good for me, because I have an old hip injury that could use some work, so I got going on the hip exercises, and...
...oh my. Those machines make you feel the burn in interesting places. There's something about having your legs widely spread and clenching the muscles in your groin and ass that makes you think of things other than your health.
And the look of the machines.
It cries out for a couple of strategic d-rings.