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My shins have troubled me most of my life but recently found doing sprints on an outdoor university track with a rubber surface (rusty red color) has been problem free so far.
I only sprint one side of the straight-away each time around about a half a dozen times - panting/gasping and walking the rest, but any other surface including soft grass would set alarm bells off almost instantly.
I will be very interested in hearing what people tell you.
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