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JustinOgara
Pro Factor Performance Surge You should do both sit-ups and crunches in your routines. Over the past few years sit-ups have been given a bad reputation. To do sit-ups safely, don't use an anchored-feet position. This way of doing sit-ups will injure your back. https://www.facebook.com/Pro-Factor-Performance-Surge-965804303473690/
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