You can do Doggcrapp’s favorite of a leg press with heels very high on the machine to target hams. I can’t find a picture online but the DC video had an exercise I picked up that was done on a 45 degree back extension machine. You keep your back straight and only move at the knees. Sort of like a poor mans’s GHR for those of us that don’t have one at our gyms.
And why do most gyms ride the leg curl suck train? The gym I train at is perfect aside from the fact it only has a fairly crappy seated leg curl.