To quote from Vivobarefoot:"Humans naturally display three forms of locomotion: walking, running and sprinting." "Jogging is a modern invention. In fact, it only began to gain popularity in the 1960’s, around the same time as padded running shoes were becoming more common."
So the question of who is a jogger is a question of form. That running should be a hobby (enjoyable) isn't a negative. Just because the word can be attached to stamp collectors and train spotters doesn't make it derogatory.
On this basis I am a hobby runner.