Share 'Competative Season Question for Mike'

hey mike... question about your ultra training plan. i think this may be on other's minds also. Specifically on the bike... tomorrow's workout (Competative season week 1), includes a bike main set of 2 x 15min at 84-92%. as i'm trying to improve my bike this time around, i have this question... is the HR the most important part of this workout? i could go out, and climb skyline drive, going 5M...