Rhythmic Gymnastics - Standard Hoop - M-13
How to choose the right size for your hoops?
The right size for hoops depends on each gymnast and there is no standard per age/category.
You can take a ruler and measure the length between the hip bone to the floor. This will give you the outer diameter of the hoop.
The hoop size is always given as the inner diameter so you can add about 4cm to get the outer diameter.
As an example: if the length between the floor and your hip bone is 75cm, then you can choose a 70cm hoop, and it should be just right. If in doubt, it's always good to ...