Debs,
I am pretty sure I did an article on this, but I might be insane……
A GHR isn’t a magic exercise, it is a superior one though.
If you don’t have access to a bench you can do any Posterior Chain exercise you like.
Ideas:
Keystone DL
RDL
Single Leg RDL
Leg Curl
Pullthrough
TRX Leg Curl
Back Raise
There are a ton of them in the Lower Body Assistance section in the Video Library.
Let me know if this helps.
Vinceri vel Mori