Why is it not more difficult to do a sit-up with your hands behind your head than when it is in front of you? - Quora
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Abdomen Crunch Human leg Thigh Knee, criss-cross, physical Fitness, people, arm png | PNGWing
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How to Do a Crossover Crunch: Techniques, Benefits, Variations
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When doing abdominal crunches, should I place my arms across my chest or behind my head? - Physical Fitness Stack Exchange
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Cross Arm Crunch
