Our expert says:
It seems you went from 3-4 km a session to a massive 23km one. It could be a number of things;
-Road walking gives different strains to gym walking;harder, different surfaces.
-Shoes can be a problem if they are incorrect
-Your style of walking, if you are a pronator can put strain on the knees.
-Doing to much too soon. Try building up your routine gradually before attempting your next walk.
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