This works best/only with a partner. I think Jason deserves a lot of the credit for thinking up this one too. But maybe I helped a little bit.
Pick one person to be partner 1 and one person to be partner 2. Partner 1 begins with running 1 lap around a gym or HPU track. While partner 1 is running, Partner 2 completes the exercise listed with the corresponding number of laps that partner 1 is running (in the first round, obviously, that is 1 lap). As soon as partner 1 finishes said number of laps, partner 2 runs the same number, while partner 1 performs the exercise listed next to that number of laps. Make sense? Let me write it out for you then explain it again:
1 Lap: partner does squat jumps or box jumps (then switch so that the running partner now does the exercises while partner 2 runs 1 lap)
2 laps: partner does jumping lunges or whichever exercise he didn't do last time
3 laps: high knees (easier: squat jacks)
4 laps: burpees (easier: walking lunges)
5 laps: bear crawl (or 3-way knees to elbow plank)
6 laps: do as many reps as possible of one exercise during each lap: 1.) bicycle crunches, 2.) V-ups, 3.) flutter kicks, 4.) Russian twist, 5.) straight leg raise, and 6.) bicycle crunches
Ok, that should make sense now. One partner runs, the other does as many reps as possible of the listed exercise until said partner has run his first set of laps. Switch. Work your way down the list until each partner runs 6 laps while the other does ab exercises for the entire time. This workout is rough, especially if your partner is slow. Choose your buddy wisely.