In a cluttered world of boutique fitness studios and high-end gear, Guillermo Piñeda Morales reminds us that we don’t need much to be our best. In the Video Op-Ed above, we trail Guillermo Piñeda Morales, a.k.a. Memo. He clocked a 2:28:42 at this year’s Boston Marathon, placing him in the top 10 marathon runners for…