The sit-up is a strength training exercise commonly performed with the aim of strengthening the hip flexors and abdominal muscles. It begins with lying with the back on the floor, typically with the arms across the chest or behind the head and the knees bent in an attempt to reduce stress on the back muscles and spine, and then elevating both the upper and lower vertebrae from the floor until everything superior to the buttocks is not touching the ground. Situps can be dangerous due to high compressive lumbar load and may be replaced with the crunch in exercise programs.
Strength exercises such as sit-ups and push-ups do not cause the spot reduction of fat. Gaining a 'six pack' requires both abdominal muscle hypertrophy training and fat loss over the abdomen—which can only be done by losing fat from the body as a whole.
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