I know you're refueled from your rest day, but resist the urge to hop straight into your workout today. Although you're familiar with the moves, starting cold isn't the best idea.
I can't drive this point home enough—never skip your warm-up. The short 10 minutes or so it takes you to stretch out and get yourself going really make a difference. All the warm-ups for this phase are the same, so if you need a refresher at any time, check back to the Phase 3 workout video.