I live in a very flat city and the hill I have been using to train on is approximately 800m long with 68m/223ft of elevation gain, with the steepest section being 160m long and averaging 13.5% gradient.
I have been using this for my Z3/Z4 workouts, but have hit a bit of a crossroads with the Z3 workouts because it only takes me around 4 minutes to climb the hill.
Would you suggest moving my Z3 uphill workouts (i.e. any workout where the reps are 12+ minutes long) to the treadmill instead? If so, what is the minimum gradient you would advise using on the treadmill?
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