group athletic adult men and women performing sit exercises strengthen their core abdominal muscles fitness |
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| navigate by keyword : group fitness women training athletic abdominal men sit adult workout people young fit exercise gym healthy strong abs active muscular body slim girl sport working abdomen man strength sportive muscle determination person cross ups athletes health flexibility leisure aerobic multiethnic effort instructor sporty toning physique sportswear female physical activity lifestyle |
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| Group of athletic adult men and women performing sit up exercises to strengthen their core abdominal muscles at fitness training. |
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