If my goal is to burn fat, is it better to do three 15 minute workouts in a day, or one 45 minute continuous workout?
My current plan is: 15 minute jog before work, 15 minutes before lunch, and 15 minutes after work.
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Your question was addressed in this randomized control trial that compared the results of two test groups that worked out 5 days per week: one group did long bouts of exercise (20-40 min per day) while the other did short bouts of exercise (multiple 10 min bouts per day).
The biggest takeaway from the study was that people were more likely to train when their program is split into smaller doses, rather than one large period. As a result, people on the smaller bout group yielded better results if only because they exercised more overall.
From the study:
These results suggest that short-bouts of exercise may enhance exercise adherence. Short-bouts of exercise may also enhance weight loss and produce similar changes in cardiorespiratory fitness when compared to long-bouts of exercise. Thus, short-bouts of exercise may be preferred when prescribing exercise to obese adults.
This source states that aerobic exercise must be done for longer than a half hour in order to burn fat effectively.