Its about 45secs in. Thats actually on the bottom of a homemade back extention.
Im attaching a part to my dip station,looks like the 2 pads on top of each other that your knees go under on a lat pull down. In the gym i grab a chair & do GHRs facing backwards on a lat pulldown or tricep machine.
I've seen that one before actually but it always struck me as a manual leg curl more so than a pure GHR?
Admittedly I'm not exactly au fait either of them, but that's just what I got from a first impression.