No time to exercise?

I hear that excuse often. And there's a way to work around it. A study published in the 90's reported that a group of people that exercised 3 times a day for 10 min each lost more body fat than the group that exercised for 30 min in one shot. How is this possible? Well you can workout at a much higher intensity if you only go for 10 min. See, that word again, intensity. Doesn't m atter what amount of time you have, peform your exercises in a challenging way. It should not feel like a walk in the park.