After a brief hiatus from working out, I decided to give level 4 a try.
It's definitely the hardest level and it's apparent from the beginning that Jillian is super-excited to have a 4th level on the DVD. She brings out a lot of new moves and some old ones. Unfortunately, my TV messed up during circuit 1 some I'm not 100% sure I did all of the circuit 1 moves correctly. Thankfully, it righted itself just in time for circuit 2. In level 4, there's more plank/push-up moves and some serious ab exercises. Once again, I had to modify or substitute cardio moves as I cannot do any of her jumping moves. Jillian ends this workout with a moment of relaxation where she builds us all up a people and encourages us to be the best we can be. It's kind of cheesy but I kinda love her for it.
All in all, I think this DVD is my new favorite. Even after completing 4 more days at this level (and 1 more at level 3), I plan to continue incorporate workouts from this DVD.