One doesn't (VERB) rollerblades. One rollerblades, or goes rollerblading. Here are a few examples from Google:
"This is the biggest sport going on right now. People are still going to rollerblade if they want to and take the risk.
... Before you try to rollerblade on a hard pavement or at the rollerblade park, practise on grass or even on a carpet (but ask your parents first!).
Protect yourself. You can't ride a bike without a helmet. It's important to wear the correct clothes and equipment when you go rollerblading too.
The white sandy beach is bordered by a broad path along which you can go rollerblading, running or simply strolling.
One also performs maneuvers, or brakes (stops), on rollerblades.
Another popular sport, skateboarding, follows the same pattern: one skateboards, or goes skateboarding.