At least six individuals are on a team wearing helmets and knee pads while rollerblading around a skating rink.
People are rollerblading for something to do.
Just because they are rollerblading doe snot mean they are rollerblading for something to do.
Not all rollerbladers skate around in a rink. Some look for something to do.
People who don't need something to do go rollerblading.