I just bought a stability ball and it's the "medium" size. It was all they had but the box doesn't specify what size person fits the medium ball. It's 64cm. The one ball I had several years ago looked bigger but said medium.
5' 5" to 5' 11" tall
The standard method for determining proper ball size is by sitting on the ball. For most exercise applications, there should be a 90 degree angle at both the hip and knee joints and your thighs should be parallel with the floor when seated on the ball.
I've been thinking of getting one of these, but the kits-the ones with a ball and a video- I see don't mention what size ball comes with it. Is it safe to assume that they are medium size?
I need a small ball. Being short can be such a hassle sometimes.
Thanks
Sarah
Stability Ball
