Hehe, awesome. Nothing like a good "barefoot" dash up a hill.
Flax will have some benefits in the absence of fish oil and maybe even some with fish oil, but for the truly dynamic health benefits a high dose of fish oil is the way to go at first. Here's a great post by Chris Kresser on fish vs flax. He also has some awesome fish/omega 3 posts, a great podcast with a leptin expert and a ton of other posts. Quality site, although if all I read was Mark's stuff I'd still be insanely healthy.
Stabbing conventional wisdom in its face.
Anyone who wants to talk nutrition should PM me!