Green Circle: These trails require little physical exertion. They have gentle climbs and descents. You will find mostly smooth tracks with few or no rocks and “moves.” Great for beginners or groups of mixed ability. 

Blue Square: These trails will likely make even the pros sweat at least a little. Climbs and descents will be at steeper grades than green circle trails. More rocks and roots. Blues are good for those with more advanced bike handling skills.

Black Diamonds/Double Black Diamonds:  A particularly steep climb or descent. Rocks and technical moves. Jumps. Length of the trail. These are the ones that will tire you out.