Today's workout is absolutely brutal, but in the best way possible. It includes a number of burly compound lifts like front squats and Romanian deadlifts done with fairly high volume, but it also piles on a bevy of great training techniques like supersets, intraset stretching, and a run-the-rack set.
Even though you'll be fatigued, don't rest between exercises during your supersets. It might be tempting, but remember that you're trying to force as much blood into your working muscles as possible. Put your legs through the wringer and you'll come out the other side with the quads and hamstrings you've always wanted.
Check the exercise videos if you're unfamiliar with any of these lifts. Then, if you're not sore after you lift today, you simply didn't push yourself hard enough.