Repeat until you hit the 20-25 minute mark
You can apply this method to any cardio activity. When I'm outdoors with the dog, I walk (fast paced) for one minute and then sprint for 30 seconds to 1 minute and repeat. Doing HIIT on the elliptical and stationary bike are great too.
An added bonus: HIIT can improve your endurance performance. I notice a difference in my endurance in just a week. I also notice a difference in my metabolism, it's revved up and my energy level is higher.
Great tip: get up 30 minutes before your usual wake up time and get in a quick 20min HIIT cardio session. You will be set for the day.. body and diet.
Check out this infograph that guides you through the benefits of HIIT
Try it out next time your doing your cardio!