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I always come home from a day of teaching feeling tired.
At first, I thought it was just the lack of sleep, the standing-up-all-day, or maybe just mental exhaustion (from presenting, collaborating, writing documents, and general stress). I also used to think that it was just me, that I was just a wimpy new teacher and would eventually build up better stamina.
Four years later, I'm still tired, but now I have an idea of why and how to fight it. Thanks to fitness trackers, I understand exactly how physical our profession is.