Don't worry about a term of art so much. Roda is what some call a "modern" Rioja. It's plush, ready to drink on release, balanced, and it ages well. It doesn't have severe tannins that need to resolve and it isn't overly acidic, nor is it a fruit bomb.
It's full-bodied, but not "heavy". But that has to do with the texture and mouthfeel of the wine. You can find a lot of full-bodied wines that are out of balance or hot or really tannic.
You just happened to pick a pretty good wine. There's a lot of wine like that, you might want to keep poking around in Rioja, although not every wine will be like that. The Beronia for example, while a good wine and BTW a great value, is a bit leaner and more acidic.
Depending on exactly what it is that you like, you can spend a lot more or a lot less. For example, Michael-David wines are plush and big-bodied. Something like Petit, or Seven Deadly Zins, or Sixth Sense are a fraction the price of the Roda. Or you can buy Phelps Insignia, which is several times the price. Different wines, but all lush and easy drinking.