Judging from the absolute consumption value of unit heat, walking fast is definitely a low-intensity exercise. For friends who have a certain sports foundation, brisk walking may not even be enough to warm up, let alone use it to lose weight. But for an obese person who doesn't exercise all the year round, walking for a short distance may make him breathless and sweaty. Therefore, from the perspective of individual differences, people who never exercise, especially middle-aged and old friends, can really lose weight by walking fast.