Home Jump Rope Circuit Workout from: Fitness is Sexy. This was really fun. I liked the jump rope parts a lot and it was insanely hard. Where I am now in fitness, I had to take at least 3 one min breaks.
This is a killer abs workout you can do while sitting down anywhere. Position yourself on the edge of the chair and grab hold of the seat just under your legs. Do the crunches by lifting yourself from the seat and bring the knees to your chest.