Stability and exercise balls -- which are essentially the same thing --are also called Swiss balls, yoga balls, Pilates balls, balance balls and physio balls. Originally developed for physical therapy purposes, today exercise balls can be found in most commercial and home gyms and fitness centers, as the balls are used for different exercises.
About Stability Balls
Stability balls can make functional exercises more challenging, which will make your muscles work harder and become more effectively fatigued. This can result in a greater amount of muscle mass, which can help your metabolism to run more efficiently. In addition, stability balls target your core and can improve your sense of balance and agility, which will benefit you in numerous types of movement, including activities such as running, soccer, tennis, dancing and yoga.
Exercise, or stability, balls can add a twist to many traditional lower-body strength-training moves. While doing squats, place the exercise ball between your lower back and a wall and then squat as normal; the ball will force you to engage your core and glutes to remain stable as you lower into a squat. Likewise, placing the top of your back foot on a stability ball during lunges will put a greater demand on your core, glutes, hamstrings and quadriceps, allowing them to fatigue faster and increase your muscle mass.
A stability ball can be used while working out every muscle group in your upper body. The ball will turn a traditional pushup or plank pose into a challenging move that can build strength in your back, shoulders, chest and arms all at the same time; this is done by placing the ball under your hands in a pushup or beneath your forearms in plank pose. In addition, sitting on the ball while performing bicep curls and triceps extensions can make the exercises more difficult. And lying your back on the ball during chest presses or placing your chest and stomach on it during rows will also increase the intensity of your workout.
Probably the one body part that exercise balls are most known for is your abs, as almost every move done on or with a stability ball requires and builds core strength. You can make traditional crunches more difficult by placing your lower back on an exercise ball or employ a more creative move, such as the stability ball knee tuck. In this exercise you place the stability ball under your shins while your hands are flat on the floor, directly under your shoulders. Your body should be in a straight line or plank position. Engage your abdominals and pull your knees toward your chest; the ball will roll forward with your legs. Reverse the movement to return to starting position.