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@rwn
Distance running is not something you can just jump into in a big way unless you're a teenager and therefore indestructible. You need to give your soft tissues and indeed bones time to toughen up and get used to the pounding.
There's something called the 10% rule: increase your weekly mileage by no more than 10% per week. Now, everyone can argue about this and exceptions, but as a rough rule it's about right.