by Sárka-Jonae Miller
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(The Best Years in Life) Ab workouts can get stale quickly as muscles strengthen ad adapt. To counter this eventuality, try adding an exercise ball to the mix. These inflatable balls are inexpensive and come in medium to extra large sizes to match people's heights. Be sure you read the box and buy the right size. Also, use a measuring tape to ensure you inflate the ball to the exact size it is meant to be for safety purposes. Read More.