Q: The description of the different levels of intensity L1 to L5 seem to be based on percent of maximum heart rate and not on training heart rate ranges (using HRR). Is this correct? Shouldn’t all levels be based on the training heart rate ranges instead of the simple maximum of heart rate?
A: Different coaches have different philosophy on it. Most of the time intensity levels come out very similar regardless of what method is used to determine them. Some coaches like to use HHR, some lactate, some VO2, and some just a simple % of the max HR. In other words, they all work.