Rice digs are awesome.
Lint, try a static hold with a fat bar. If your gym has one of these, load it with a "60 second" weight. Of course this weight is to be determined but set the safety bars in a power rack about 3" from lockout. Pick up the loaded fat bar and stand at lockout for 60 seconds. Enjoy the burn.
And of course the favorite - If your gym has a track - DB farmers walk. Grab a couple 90's a give'r.
"The most merciful thing in the world, I think, is the inability of the human mind to correlate all its contents... some day the piecing together of dissociated knowledge will open up such terrifying vistas of reality, and of our frightful position therein, that we shall either go mad from the revelation or flee from the light into the peace and safety of a new Dark Age."
-H.P. Lovecraft