If I'm running on my own, I always have my nano with me...that being said, it's more for background noise than anything else, although sometimes I do find myself doing a little jig as I run. I don't find it makes any difference to my mental toughness..when i train, i am thinking about everything I do and just like the music to be there to keep me company...in the race, there is so much going on around me and I'm a bit of a talker on course (usually only to volunteers) that I'm cool either way. I don't miss it come race day.
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Good athletes train when they want to, great athletes train when they don't......
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Good athletes train when they want to, great athletes train when they don't......