I’ve been doing this super intense cardio routine for the past few months with outstanding results. When you are pressed for time and you cannot devote 30 or more minutes to cardio training this is a simple, but excellent method of increasing and maintaining your cardio fitness. It consists of the following exercises:

Squat thrust -- 10 reps
Mountain Climber -- 10 reps (counting 1-2-3-ONE-1-2-3-TWO)
Squat Jump -- 10 reps

Repeat these exercises until you have done 100 reps total. You will end up doing 40 squat thrusts, 30 mountain climbers, and 30 squat jumps total.