I have talked to some of you about doing intervals outside. It does not have to be perfect, and if you need to slow down for an intersection or something similar in the middle of an interval, that is fine. Some advantages of doing a workout outside are (1) being outside!, (2) learning how your bike behaves and your handling of it during different efforts, cadences, and body positions (steated standing, etc); (3) become familiar with how different efforts help you build and maintain speed; (4) training the body to deal with the elements while riding hard (wind, heat, etc.)
Of course doing workouts outside is not mandatory, and some prefer the model workouts = indoors and everything else = outdoors. There is no right or wrong. But if you chose to do workouts outside, don’t be too concerned with them not being “perfect” like they would indoors.
Here are a few screen shots of some of my workouts outdoors. I live in a busy suburb outside of Chicago, and depending on the time of the day, I can’t get more than 5 min uninterrupted. But that’s fine and I still do all of my workouts outside during the warmer months.
(Blue line is cadence)
The one below was in Zwift outside of the “workout” module (I selected a free ride on a course and did the intervals just like I would outside):