Hi Joe, I'm a road cyclist who use to do running and trail running as cross training in fall/winter. With little specific training I did my first 50k trail a few weeks ago, and next season i'd like to do both bike and (ultra)trail-running races, not stopping running at spring anymore. I absolutely loved your cyclist's training bible but now i'm looking for something to program the next season doing regularly running and cycling, do you think i could use your triathlon's bible's as a base to train for both these sports, perhaps modifying the periodization of disciplines depending on the kind of event i target? Because i'd like to progress from a "cross-training mode" to a multi-sport one but need the training bases to do so. Thank you from Italy Alberto