Our expert says:
Do you mean 4km three times a week - 40km is a major distance. Or is it cycling?
In any event, might be a problem with the flow of blood to the legs, that happens sometimes. I'm thinking it's probably not this, though, because that usually causes quite a bit of pain as well. You need to monitor it, obviously, and make sure it doesn't get worse.
The other option is a nerve irritation in the lower back, which can easily be referred to the shin because all the nerves to your legs originate in the back area. So that's certainly an option. I think the only way to know that is to go for physio, and have them assess it - by poking and prodding and seeing what they discover. Once that happens, you can begin to treat properly.
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