(HealthDayNews) -- Fitness balls are the latest hot exercise tool, and for good reason: they make you work muscles that are otherwise easy to neglect.
Fitness balls place the emphasis on the muscles in the trunk -- including the abdominal, chest and back muscles -- according to the Mayo Clinic. They work by constantly changing the base of your body's support. So by challenging your balance, just sitting on the ball becomes an exercise.
Use the ball for abdominal curls, modified push-ups or other exercises you normally do on a gym mat. A slightly deflated 55- or 65-centimeter ball works best for most people.
