Put your mat away and give your neck a rest. āStanding abs exercises work more muscles than crunchesāand the more muscles we use, the more calories we burn,ā says Sara Haley, creator of The Daily Sweat workout DVDs

Put your mat away and give your neck a rest. āStanding abs exercises work more muscles than crunchesāand the more muscles we use, the more calories we burn,ā says Sara Haley, creator of The Daily Sweat workout DVDs