Strengthen Your Abdominals with Stability Balls
Internet URL
http://www.acefitness.org/fitfacts/fitfacts_display.aspx?itemid=129 
Sponsoring Agency
Description
The stability ball - an extra-large, inflatable orb designed to improve balance while targeting specific muscle groups - can be adapted for many uses, including developing core strength, improving posture and facilitating stretching, among others.