I have noticed in my last 4-5 continuous tempo runs (~20-22 minutes long) I seem to surpass the threshold despite efforts not to.
I know you have mentioned that an exhalation less than every 6 steps will result in lactic acid accumulation and signals the crossing of the LT.
Would you say that this is the best indicator, or how the legs feel? I want to know the best way to monitor perceived exertion and how to stay below the LT without buying lactic acid analyzers or HRM's.