The synchronized hearts Curiosity · San Pedro Manrique, Tierras Altas, Soria Image of San Pedro Manrique, not of the place itself. A scientific study published in 2011 measured the heart rate of those who crossed the embers and of their relatives among the audience, and found that both beat in synchrony during the crossing. Photo: The original uploader was Barahonasoria at Spanish Wikipedia. (CC BY-SA 3.0) What to see and do in San Pedro Manrique