
During the run, we worked on effort levels. The theory is that there are 4 effort levels (E1, E2, E3, & E4). E2 is supposed to the comfortable pace where you can still talk and run. E3 is a little more challenging, your breathing should be a little harder. E4 is all out. You shouldn't be able to talk more than a word or two when you are in E4. E1 is a nice, slow pace where you can recover from harder running.
We did some drills where we alternated between running E4 and E1. First there was a nice normal warmup lap in E2, and then the hard running began. We did about a minute or two in E4, and then a minute or two in E1. This went on for about an hour, and I was really thirsty afterwards (and tired). I slept like a baby that night.
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