These two kinds of exercises are not the best exercise for thin waist and abdomen. You should know that there is no partial weight loss method. If you want to lose weight, you should lose all the body fat. You can do aerobic exercise, such as jogging, brisk walking, skipping rope and swimming. Yoga and Pilates you mentioned are mainly about shaping, while swimming has the dual effects of reducing fat and shaping. Look at the men and women who are in poor shape when swimming.