Boosters

My coach says I should use a booster. I've got 3 questions.

Are they illegal?

What is the best type of booster?

How much roughly do they cost? Thanks Alois 

Hi Benedict,

Boosters are illegal because they are an additive to the rubber.  Rubbers are approved in a certain form so adding or changing the qualities of the rubber is not allowed.  There are some other chemicals in Boosters apart from VOC that are not healthy for you.

I don't have a recommendation for a good booster.