That is weird, maybe you have one leg shorter than the other or something. When I first had it I didn't know what it was and tried running it off. It lasted about three weeks.
However I can play football and cover lots of ground and not have a problem, it can't be the surface either cos I've ran on grass and still had shin splints. Must be technique and I've used a different one for football, more movement and shorter bursts or whatever.
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