For the first time, my trainer overslept, so I showed up at the gym and she wasn't there. Instead, I jogged for a few minutes on the treadmill. Only 20 minutes, with walking nearly half the time. I haven't been aerobic and vigorous much recently, and it feels really good to have gotten the heart rate up so high, taken so many deep breaths, and probably have some endorphins circulating.
I think of it as like flushing pipes with strong jets of water - the blood rushing through my arteries and veins at a fast rate, opening up and removing clogs. Probably not what's going on inside, but I like the feeling.
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