Strengthen the core and fire up your abs with this medicine ball sit-up.
• Lie on the mat with knees slightly bent
• Make sure your core is engaged and your entire back is flat against mat
• Hold medicine ball at chest level
• Curl body up to a seated position
• Extend medicine ball directly out from the chest until arms are fully extended
• Curl back down through the body, releasing through the core, slowly bringing medicine ball back to chest and returning back flat against the mat
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