Here’s a glimpse into what Biathlon is, what makes it tick and how it unfolds. “Shooting with a high heart rate is really difficult,” says Armin Auchentaller of Antholz, Italy who coaches the U.S. women’s biathlon team. Lowell Bailey, a retired four-time US Olympic biathlete and the team’s high-performance coach, says the combination of fast skiing and high-pressure shooting makes …