Discussion: Extremely strenuous exercise, which is irregular, is not a good recipe for long-term weight loss.

Practical issues concerning obesity.

Excessive exercise activates the hunger hormone Ghrelin, causing an increase in appetite. Concentrated caloric expenditure has no cumulative effect when it comes to irregular activity. Therefore, anyone who plans a week of spinning with 1000 calories in each workout followed by a month of binge eating should think twice.

Link: Why do many weight loss diets fail in the long run?
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