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- [2] SCHOOL SIT-UP EXERCISES ARE NOT HARMFUL TO ILIOPSOAS MUSCLES OR TO SPINE JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION, 1976, 236 (02): : 200 - 201
- [3] BIOMECHANICS OF SIT-UP EXERCISES MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, 1981, 13 (01): : 54 - 59
- [4] Effects of Sit-up Training versus Core Stabilization Exercises on Sit-up Performance MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, 2009, 41 (11): : 2072 - 2083
- [8] CAN SIT-UP EXERCISES BE HARMFUL FOR CHILDREN JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION, 1973, 223 (05): : 565 - 565