Stability balls are known by number of names: Swiss balls, Pilates balls, yoga balls, exercise balls, and balance balls. The durable vinyl spheres first started showing up in Europe in the 1950’s - used by patients seeking muscular and neurological rehabilitation.

Stability balls, which are durable vinyl spheres, are now a serious part of fitness and exercise programs in gyms and fitness clubs nationwide. They are used in Pilates classes, in aerobics classes, in weight training, and by personal trainers for a host of exercises - from stretching to relaxation to strenuous all-around workouts.

The stability ball didn’t move beyond the realm of physical rehabilitation and enter the fitness scene until the late 1980s, and then only on a limited basis. Mike Morris, president of the Resist-A-Ball, Inc. was one of the first to use stability balls as a fitness tool in the United States. He rolled out his Resist-A-Ball at fitness trade show in 1993.

Experts say that the balls are an excellent, low-impact way to improve existing workouts. The balls are found health clubs and are small and sturdy enough to be used at home.

Stability balls ranging from 21 to 24 inches in diameter are suitable for most people, although people more than 5-feet-7 inches tall might choose a larger diameter ball.

When a person does a basic sit-up on the ball, his or her back is pushing into the ball and forcing the exerciser to work harder. It’s a big improvement over a floor sit-up, when a person’s back naturally tends to rise up off the floor.

(Quoted material from The Monitor.)