Of course. But it depends on the degree of exercise. A little exercise won't make you thin. As long as you exercise properly, you can make your legs strong.

Roller skating is a good aerobic exercise. Long-term aerobic exercise consumes not only fat, but also muscle. Therefore, turning roller skating into aerobic exercise can play a slimming effect.

Sports physiologists have found that when the amount of exercise reaches 60% of the maximum heart rate, the body consumes more fat than sugar (glycogen) or protein (muscle). But if the intensity of exercise is higher than 75% of the maximum heart rate, the body will directly use fat, sugar and protein as energy sources. In other words, the harder you practice, the more calories you burn.