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Does anyone here train CrossFit with a heart rate monitor? I believe that I have been training too hard at CrossFit (lingering fatigue, heightened soreness, moodiness.) In my spare time, I've been reading a lot about lactic acid production (in regards to ATP production by cells during aerobic versus anaerobic exercise) and am really starting to grasp why aerobic is better (in general) than anaerobic work. This morning, I wore a HR monitor to see how things went and I think it gave me a clear indication that I'm spending far too much time on the anaerobic side of things in the longer WODS. For example, this morning's WOD was a 30 minute EMOM. Minute 1: 4 back squats @ 75% 1RM Minute 2: 8 Burpees Minute 3: 12 Ab Mat Situps. My aerobic threshold (after VO2 max testing) is about 157. I was at 170 by the end of the first set of back squats. I only recovered back below 157 four times in 30 minutes (for less than 30 seconds each occurrence) My max HR was 182. Obviously, I have no control over programming at my box. I basically have two choices on the days I show up for a WOD - the regular WOD and either the Endurance WOD. I also have no control over the coaches "pushing" me to go harder/faster. But, am I doing more harm than good by spending extended periods of time at these higher heart rates? Ultimately, I'm responsible for myself and my overall fitness. So, those of you that wear a HR monitor... Do you stop/break if you're above your aerobic threshold during a longer WOD? (I am primarily talking about longer WODs here, since I do understand the benefit of some anaerobic work -- but that those should be quicker WODS, like Fran, Grace, etc.)