No need to match targets exactly on an outdoor ride.
Those who want to attempt that will load the workout, ride to a portion of their route that supports controlled efforts, then start the workout and roughly complete it as terrain allows. The target strain ratio is your goal, not exact intervals.
Or consider the advice on the left side of the XATA page which indicates parameters for a free ride to Focus duration. You would do this instead of riding a pre-defined workout.
See this post for more info –
Xata free ride recommendation - #2 by ridgerider2
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