Create some basic tenets for Letsrunziqa which not only express your inner self as the runner you are, but simultaneously make you as obnoxious and repulsive as possible, going far beyond merely annoying everyone in sight, but actually violating standard codes of conduct, going against mainstream cultural values and disrupting life for everyone who cares about common courtesy. For example, a sacred purification ritual of the "religion" could be to avoid bathing for the two "holy" weeks of Letsrunziqa, wearing the sweatiest unwashed running clothes and the stinkiest shoes you have and to give two-minute hugs (in the name of good will, of course) to complete strangers in crowded shopping malls or in fine dining establishments. Don't forget to wear bunhuggers that are two sizes too small and stuff a prize-winning cucumber down the front just for additional shock value.
When promoting Letsrunziqa, which you should do at every opportunity, even if it means being a giant anal pain to everyone, be sure to harp ad nauseum on the "millennia-old traditions" of this wholesome, enlightening "religion of self expression" even though you only thought up the mumbo-jumbo "traditions" while sitting on the crapper last week.
Change your name to something that looks like part of one of those "cryptoquiz" decipher-the-code puzzles where letters are substituted for other letters. Make your new name vaguely running related, like Ekki Dehn or Pharr Tleq.
Come up with a gibbering, unintelligible "language" loosely based on runner's jargon and demand that everyone bend to your needs by accepting it. Refuse to speak proper English yourself. This is the USA, after all. Insistence on using English of any sort, let alone rich, clever, highbrow English which communicates ideas common to the daily lives of Americans over the past couple of hundred years, will soon be offensive.
Start a huge campaign to have Christmas decorations in public places first accompanied by (then later entirely replaced by) decorations which depict the ooga-booga rituals, dress, hair styles, jargon and other recently fabricated tenets of Letsrunziqa. As usual, gain the attention of bullshit rights groups and pandering, enabling politicians to further your cause.
Above all, always insist on being called "runner" and never the hated "jo**er." If anyone mentions the J word, even when not referring to you, raise a big stink, punch them in the face and threaten a discrimination suit. In fact, any word other than "runner" is unacceptable and is grounds for a pride parade or some other massive sign-toting demonstration exploiting the faux guilt you can instill in the offenders. Parlay the whole shebang into oodles of special privileges and handouts.