yesterday was my first sweet spot workout. 4x10 minutes. Hard but not over the top. This morning was 90 minutes near the top of zone 2. From a power perspective, the workout went as planned. However, the second half of the workout this morning, my heart rate drifted up into zone 3 a little. Is that normal after a harder workout the day before or do I need to take another look at my heart rate zones?
Thanks in advance!