If seizing the day is your thing then Carpe Diem should be your workout. This is a high-speed, high-intensity, Level IV workout that will put you in the sweatzone from the very first set and keep you there for every set after that. Get your knees to waist height during High Knees and don't forget to pump your arms. Everything is time-based which means that reps really matter. Try to get as many as you can in each exercise and maintain or improve the level in each set. Add EC (you will really know the burn then).
Extra Credit: 1 minute rest between sets.