tyler4588 wrote:Do you use a trainer at all? What about cranking the trainer up to a nasty hill climb and just sitting on it for an hour to get that ideal venue for high BPM exercise?
No, despite its disadvantages, LA has incredible road cycling! I haven't used a trainer, so I can't comment beyond saying I'm suspicious that I wouldn't personally have the motivation to ride indoors. I ride my bike because it's fun and because group rides can get quite competitive.
I think the answer you're looking for is that you should bike a bit and run a bit and adjust the ratio according to what you like best. Just don't ignore running too much (or at least substitute for it with long hikes instead of more cycling) so that your body is ready to take abuse on trails.