After nearly three months of consistent training, you're seeing true results, but that doesn't mean you can go soft the final week. These workouts might seem old hat by now, but that's no excuse to slack. Make sure you open your arms to get a full pec stretch on each and every cross-over jack, extend your back leg fully during the pigeon stretch, and get full hip extension during each crab bridge.
In this last week, you'll be doing more reps than you did in the first two weeks. Finish them all. Progression builds bodies!