With High Intensity Interval Training (HIIT), busy adults can get a good workout in about half the time it takes with steady state cardio. That’s an attractive benefit, especially when you consider how many people say they just don’t have time to exercise. New research from Iowa State University suggests the intensity aspect of HIIT can be a drawback.
 

According to the National Health and Nutrition Examination Survey, only 3.2% of American adults meet the recommended guidelines of 30 minutes a day, 5 days a week moderate-intensity activity. The World Health Organization recommends a total of 150 minutes of exercise each week

Convincing less active adults to step up their game with HIIT sounds great until you consider research published in the Journal of Sport & Exercise Psychology. The study compared subjects who started with vigorous exercise and then decreased intensity with subjects who took the typical approach of starting out slow and gradually increasing intensity. The intensity increasing group went into each session remembering a negative experience while the group that decreased training intensity expected to feel good after future workouts.