While I was 'cruising' for 2 weeks and not doing DC, I did this for quads and they were so sore that climbing even a couple steps was agony for 4 days, and they were still a little sore 6 days later.
Squat 225 x 20 rock bottom reps, rest three minutes, 225 x 20, rest three minutes, 225 x 20.
Rest about five minutes and then did walking lunges with 100 pound bar, about twenty-five steps each leg, rest three minutes, did it again,
Did lying leg curls and stiff-leg deadlifts too, but it was those two exercises that put a hurting on my quads for almost a week.