I have struggled with myself over going shirtless in a variety of situations, but for some reason I have relatively little problem running shirtless. If I'm out there huffing and puffing, running 4-5 miles, then I am doing more than most 99 per cent of the folks who cling to their couches.
I can run shirtless without having to mess with a wet T-shirt, I love the feel of the sun and the wind on the skin, and an hour several times a week can produce a pleasant tan without overdoing it and getting burned. Most of the time I jog at a track at a junior college near my home. 95 per cent of the people there merely walk the rubberised 1-mile track, but rather consistently I get two kinds of comments from people:
The first is comments on how far I run.
The other is comments about how fit I look.
The comments have consistently been positive. So I just use that for added encouragement to continue on, even if it is a bit cool.
Good luck with your blog. And enjoy your runs!
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