Garmin Forerunner 920 Blue/Black  (Certified Refurbished) VO2 MAX, RECOVERY TIME & RACE PREDICTOR2 Forerunner 920XT estimates VO2 max, recovery time and predicts your race times for several distances when used with heart rate. RUNNING DYNAMICS1 When paired with the HRM-RunTM monitor, the Forerunner 920XT provides feedback on running form by measuring cadence, vertical oscillation and ground contact time. METRICS THAT MATTER Record speed, distance, ascent/descent, grade and more. Pair with ANT+ compatible sensors to measure heart rate4, speed4, cadence4 and power4.