Heart-Rate Training at a CrossFit Affiliate

Functional-fitness facilities, especially CrossFit gyms, are not known for their machines. "We are the machines!" is a catchphrase touted by many. But at CrossFit Justice in Milford, Michigan, athletes are bringing back the tech—not via elliptical, but with heart-rate monitors. It's not all that different from the "classic" CrossFit workouts you might be used to. But at CrossFit Justice, you're more likely to find athletes dutifully responding to heart-rate-driven coach cues to get the right ...