In one of my boot camps here at work. Allison had us do The Big Ten workout as one of our last circuits. From what I remember it consisted of push ups and sit ups.
Try this Big Ten out
How it works: you will do 10 of each exercise, then 9 of each, then 8 of each, 7 and so on til you get to 1 of each.
Let us know what you think or if you have any other exercise combination that you like to add.