Rapid Abs; how many sets can you do?

Only 5 exercises, easy peasy right?? Do 20 repetitions of each: 1) Sit up Oblique Twist, 2) Plank Toe Taps, 3) Oblique (or regular) Mountain Climbers, 4) Toe Touches and 5) Reverse Crunch for 100 total reps in! Repeat as many times as you can. How fast did you get through this? How many sets could you do? **Make sure to press your back into the floor by tilting your pelvis. Which was your favorite exercise, and least favorite? I know the hardest for me are the Reverse Crunches with lift. OHHHHHH, but soooo good!