Nearly all, you can't get blood out of a stone Hopey.They're big powerful muscles, that need a lot of resistance.
Lie on a high table,with your torso hanging over the edge.You'll have to secure the thighs for this, so get someone to hold them down on the surface of the table.Now bring your body up and in line with your legs.Then lower again.Do as many as you can.
You could also try free standing squats, but really they(glutes) need high resistance.