Ride in Zone 2 / 85 rpm+. In your warm-up include 5 minutes in Zone 3 / 90-100 rpm. Perform 2 x 20 minute Threshold intervals / 85-95 rpm (see Specific Interval Zone pdf). Ride easy for 10 minutes between intervals. - TT bike/aero bars. *See Training Zone calculator included with this plan to determine your specific interval zones.