In fact, obesity is related to personal physique. Some people are not fat if they eat too much, while others are fat if they don't eat. Practicing martial arts is not equal to losing weight. You can buy an arm. You can practice for a short time every day and do simple exercises such as sit-ups. It won't take you too long. Half an hour is enough. Fitness is no problem. Exercise pays attention to the method, not the length of exercise time. After all, martial arts is not your profession. Martial arts requires you to know skills, and practice only increases proficiency and attack intensity.