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In her fourth Women’s Running-exclusive Diet Bet Challenge video, former cover runner Karina Smirnoff demonstrates a standing ab exercise that can be done anywhere that allows space to twist from side to side. This workout targets your abs and obliques. She recommends 3 sets of 10 on each side, but we say start with however many are comfortable and build up! Follow and join her entire #LoseWithKarina challenge at the DietBet website.