The simple-but-brutal Bergeron Beep Test workout involves barbell thrusters, pull-ups, burpees, and a lot of mental fortitude.svetikd/Getty Images Top CrossFit coach Ben Bergeron is renowned for ...

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The Fitness Pacer Test starts deceptively slow but ramps up quickly. Each beep demands faster sprints with less recovery time. At first it feels manageable, but fatigue sets in faster than expected.