Interval Training is unique in the fact that it would likely be done quickly. MegaMaximus For example: suppose that a person a particularly busy week coming up; but are usually to work-out at least twice, and it can just done during your lunch hours. Give yourself 10 minutes to dress down on the gym clothes, 40 minutes for your work-out, then 10 minutes to shower and dress again. Method to to get in your full-body work-out; you do 2 minutes per set (10-12 reps each) with one minutes rest in between each. Because each set has to become done so quickly, the achieving some cardio benefit as clearly.