rollerblading is fun for like 15 minutes. and all there really is to do is rails. sure it helps balance, but so does skateboarding with loose trucks. and you can skateboard anywhere. i say skateboard instead
roller blading is for little kids. its basically freestyle walking. skating is way sicker and will help your balance a ton. watch tony trujillo and you'll wonder why you had to buy some lame ass blades,
yeah, skateboarding helped my rail balance shitloads, just riding around helps your balance standing sideways, and you get such a feel for where your feet are at all times because all the motions are so precise.