Lately her life has become even more chaotic and she has to choose between 30 minute High Intensity Interval Training (HIIT) classes three times per week or two longer moderate intensity exercise classes.
She has a very good question - What is the best type of class to burn fat?
Typical guidelines indicate that healthy adults should exercise 30 minutes five days a week or 150 minutes per week.
However, a 2011 study from NCBI (National Center for Biotechnology Institute) indicates that vigorous exercise for at least 20 minutes three days a week or 75 minutes per week has the same impact on your body.
The study found that the type of exercise (low intensity vs high intensity) does not matter. https://examine.com/nutrition/be-the-tortoise-or-the-hare-it-doesnt-matter-for-fat-loss/
The number of calories burned will impact weight loss. There are 3500 calories in one pound of fat.
Therefore, if you go to a HIIT (High Intensity Interval Training) workout class you have to make sure to burn calories. Just attending the class is not enough - you have to work really hard.
Although HIIT is beneficial there may be some fallout after the exercise class. Holly Perkins (experienced personal trainer) indicates that HIIT burns carbohydrates and not fat and that you may crave sweets, have an energy slump or experience a pronounced appetite the next day.
Just be aware of this and pay attention to how your body feels. Make sure to eat healthy after class and the next day. https://hollyperkins.com/the-problem-with-hiit-workouts/3368
Calories and fat burn aside I think the most important element of an exercise class or activity is to do something you enjoy.
If you do not enjoy it you will not do it long term. If you dread going to class or feel sore the next day going to class is not going to be a permanent part of your life.
Also remember that what works for you may not be the best solution for someone else (your best friend, sister, etc.)
5-22-2018 I just read an article in the May, 2018 Runner's World magazine (page 13) that indicated a HIIT workout is easier to do than a longer workout if you had a long day and have mental fatigue. It is harder to focus and complete a longer workout when you are mentally drained and HIIT is easier because it is shorter and high intensity.
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