Maximize Calorie Burn: 20 minute Workout!

If you are short on time and you have about 20 minutes to workout. First start off with a 5 minute warm up. After you warm up. Start running, walking-etc for 2 minutes at a fast pace, then 1 minute at a slower pace, then 2 minutes hard again and 1 minute at a slower pace. Do this for 20 minutes and cool down. You have maximize your time and burned a lot of calories. Don't forget to stretch!