Grit measures the difficulty of a mountain bike trail. It takes into account factors such as the trail grade and the angle of turns along the trail. The Grit score of a given trail should remain fairly consistent from rider to rider. It’s a useful metric for comparing the difficulty of the different trails you ride.
Your Garmin device continuously calculates Grit during your ride. Afterwards, when you sync with Garmin Connect, you’ll see a chart of the Grit scores throughout the ride and an overall score for the ride in Garmin Connect. You can also view the Grit rating along the trail on your activity map. The more difficult the trail, the higher the Grit score should be.