It's simple, yet a butt kicker.
The key to this workout is that you have to push yourself. If it's a casual stroll in the park, you won't get nearly as much cardio and lung benefit as you would if you give it your all.
We had 10 minutes to complete the following on a treadmill:
Run .5 miles at a 1% incline
Get off the treadmill and do 10 jump-squats
Run .25 miles at a 3% incline
Get off the treadmill and do 10 jump-squats
Run .25 miles at a 6% incline
Get off the treadmill and do 10 jump-squats
Run .25 miles at a 9% incline
Get off the treadmill and do 10 jump-squats
My 10 minutes ran out right after I completed the .25 miles at 6%. I actually like the fact that I did not complete the task today as that gives me a goal and motivation for next time.
If you try it, let me know how it goes!!