exercise balls

[mina1]

how big should an exercise ball be if you want to do crunches on it?

 

[mina1]

how big or small should a exersice ball be?

 

[maleficent]

the stability balls?

it's based on your height...

 

[h34vyK1tt13]

it depends on your height...believe it or not a small one is actually better than a huge one