Lean over the ball so your hands and feet touch the floor, and while raising the left arm, also raise the right foot. Lower them and repeat before doing the same with your right arm and left leg. Simple eh?
You get to feel your body transform with exercise balls but be sure to get the right one for you and the kind of stability and balance balls exercises you need to practice. Exercise balls come in various sizes so you want one that is the right size and weight for you. A general rule of thumb in selecting an exercise ball is to practice sitting on one. If your thighs are parallel to the floor then the ball is the right size for you.
You will probably need comfortable training shoes with a strong grip and mild padding to elbows and knees as you may fall off the ball in early usage. They are usually employed on bare floor rather than on gym mats or carpeting. It is however increasingly possible to use a framing cradle that will help to stabilize an exercise ball. This will help nervous beginners and also keep the exercise ball from moving when its use is accompanied by use of weights, dumb-bells, etc.
Muscle strengthening with exercise balls is nothing new. The first exercise balls were used in Switzerland in the 1960’s but it was in the 1980’s when they became popular in the USA and the rest of Europe. They are used in many gyms and in Pilate’s classes as well as in professional athletic training regimes.
Sadly, I do very little exercise either with or without such apparatus.