Recommended to select gym ball size

pu1. As you said, it's most accurate to do it according to the height. In general, you can use 65cm a lot and change it little by little depending on whether you are taller or shorter than average

2017-11-29

OK

pu2. I usually use 65cm

2017-11-29

OK

pu3. The height on the left and the size of a gym ball on the right. You can choose like this
: : 90cm

2017-11-29

OK