One woman found an excellent way to stay motivated during a long run. Anna Orso of Billy Penn planned on running the Philadelphia 10k, until she found out the time to register had passed. That’s when she decided to run the course her own way. Though she wasn’t officially a participant for the race, Orso planned to race and stop at every taco shop along the course. He chosen plan ended up taking her to 13 taco shops, for a total of 14 tacos and one margarita consumed over the course five hours. But 14 tacos proved to be challenging in itself. Between tacos seven and eight, and at only 3.4 miles down, Orso starts to worry about her food fatigue, but pushes herself along: I’m starting to get fatigued. I walk into the 7-Eleven at 11th and Washington in search of water. I’m parched, and feel like I haven’t consumed a…