by susan | 4 November 2012 11:53
The sit-up is an abdominal strength training exercise commonly performed with the aim of strengthening the hip flexors and abdominal muscles. It has overlap with crunch.
It begins with lying with the back on the floor, typically with the arms across the chest or hands 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.
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