Jump in an Arena? Some venues hold classes on grass. Its a way to know that the class is on a surface. Or might you mean classes at Arena UK which is a venue?
Arena show jumping isn't really anything other than normal show jumping in an arena. It isn't a term that's used. Do you mean arena eventing? If you do that is set up in an arena where the first 5-19 jumps are ordinary show jumps then you immediately carry on to jump the cross country jumps. In reality they're just rustic jumps erected in the arena. Sometimes you will leave the arena to jump a small water complex & then back into the arena to finish.
