I think you are right it isn't a rule but I think it ought to be but maybe 10 miles. With excemptions where people live in rural areas and need to travel to the nearest supermarket or pharmacy. In the last lockdown lite we had people making a 200 mile round trip for "exercise" .......common sense?Where have you got this rule from? I’ve not seen it anywhere. In fact I’ve not seen any restriction on the distance re exercise.