I've seen screenshots from the film, Heath looks great in it.

Yes, although he wears fake teeth and mumbles almost as much as Ennis, except in California accent instead of Wyoming. He portrays a real-life guy who owned a surf and skateboard shop in the Dogtown neighborhood of Venice, CA, in the 1970s. The film is about what happened when they introduced skateboards with polyurethane wheels (as opposed to metal wheels, I guess) that were much faster and could do fancy tricks. Here's Heath with the guy, Skip Engblom:

The kids who hung out there and used the skateboards, practicing in empty swimming pools, became the first professional and sponsored skateboarders. Those real-life kids are the main characters in the film. One of them, Stacy Peralta, wrote this movie, and also wrote and directed a related non-fiction documentary about the same thing called "Dogtown and Z Boys."
There! More than you ever wanted to know about the origins of modern skateboarding!

Fun fact: Stacy Peralta (whom I had to briefly google) is nine days younger than me.