1/ what's size you need ?
Use your measurement to get the yoga ball in an appropriate size.
If you are 5 feet (1.5 m) or shorter (152.4 cm), you will want a ball that is 18 inches (45 cm).
If you are 5 feet (1.5 m) 1 inch (155 cm) to 5 feet (1.5 m) 7 inches (170 cm), try a 22 inch (55 cm) ball.
Effectively performing exercise ball activities requires careful selection of the right exercise ball size. Because personal consultations are not always possible, physical therapists, exercise trainers, and other professionals have constructed several guidelines to use when selecting the proper exercise ball size.
2/ HOW TO USE ?
Some of people do exercise with yoga ball, they didn't know how to choose.
and then, now on so many ball supplier 's ball only for kid's toy roller , not for exercise use.
so, please note that the ball weight when you choose
if the ball for exercise, please choose the heavy weight or anti burst ( the ball is more cheaper, please be more attention to their weight)
3/ what's difference from surface on ball ?
you will find out there are several material and surface, what's is correct one ?
the ball with flat surface is for ball game, or other use.
ball with stripe line, it's for exercise use, also have anti slip function.
ball surface has particle texture, it's a anti burst ball.