Simple, but not easy, is one way to describe this workout.
Don't skimp out on the warm-up. It's going to be worth it to get extra warm before today.
Pushups - knees, toes, elevated - no matter which version, you're going to have to break them up. Do it well before you reach failure. And get ready for the 2nd round
Front Squats - The Tabata is 20 sec on, 10 sec off, for 8 rounds. Use any weight that you can maintain 20 seconds of work with. Really, the workout will be hard even without weight.
Your score is both time to complete and the reps of the front squats.
Hit me up with any questions you may have.