On any lower body movement, let your knees externally rotate a little bit so you can reach your hips back and load your glutes on the eccentric. I don't know the exact biomechanical sequence blah blah blah, I just know this works. Try it.
"Roll your knees out" will take pressure off your knees and tax your hips which is what we're all after.
This will work on lunges, reverse lunges, rdl's , conventional deadlifts, close stance squats...