Sit-ups mainly exercise the abdominal muscles, the effect time varies from person to person, usually about 1 month to see results. Sit-ups mainly exercise the waist and abdominal muscles, to enhance the strength of the abdominal muscles, shaping the abdominal muscle line of common training movements. Adhere to daily exercise, help reduce abdominal fat accumulation, beautify the abdominal muscle line, belongs to the effective weight loss and slimming. If you do 50 sit-ups a day, for most groups, adhere to about 1 month abdomen can become flat, and less rebound. It is usually recommended to do 1 group of training in the morning and evening, 1 group of 25, because a one-time do more sit-ups, may lead to abdominal pain on the second day, so it is recommended to be divided into morning and evening 2 times. However, if there are cervical and lumbar spine pathologies, it is best not to use this training, because there is a risk of injury to the spine, injury to the spinal nerve or spinal cord, resulting in serious dysfunction. Sit-ups should be used in the correct way: lying flat on a harder mat with both upper limbs on both sides of the body, both lower limbs hip and knee flexion, head and neck and chest torso at the same time lift and knee joints close, and then relax and lie flat. Weight loss needs to pay attention to the appropriate method, pay attention to avoid strain, relaxed mood. At the same time can be combined with a certain diet regulation, such as eating more fresh vegetables and fruits, avoid eating greasy fried food.