Target was between 91 - 131 watts for aboutt 20 miles. Lack of just straight uninterrupted flat road or trail makes it very hard to stay within those boundaries. Even tried riding my brakes down grades to keep the watts from dropping off - not much success there. I’d blow right beyond the upper limit and then back off kind of soft pedaling and drop under the 91 low mark. By the the terrain would change again or the wind would have shift and I’d have to analyze and come up with what’s appropriate to stay within the above boundaries. Kind of annoying but so far I’ve seen that when I do manage to hold a high percentage of the workout within the ascribed boundaries within days I see very significant increases in areas I didn’t anticipate and Garmin doesn’t do a good job of sharing the meaning of any prescribed workout.