I am on a mid-level rowing plan and noticed that there is a very broad range of HR specified with VO2 max workouts. I did a bike session 40"-20" today and the range on the workout description for 40" was 95-146 HR. The graph included in the workout description indicated 120 HR for the 40". I know that 40 and 120 are too low for Z4. I decided to follow the graph and stayed in the 120 HR range. The analysis showed I spent way too much time in Z3. I had to look at my bike HR zones to figure out I needed to be at 136 minimum to hit Z4. It would be great if the app can just tell me what the HR rate minimum and maximum should be for the desires zone in the description and graph. Rowing workouts have the same issue. I do mostly rowing workouts but work in bike sessions as well. Hoping this can be make more specific for future workouts. Thanks.