Flat: May have some short gentle grades
Rolling: Gentle grades
Moderate: Moderate grades less than two miles
Hilly: Short steep grades and long moderate hills
Mountainous: Very steep grades and climbs approaching five miles

Casual: Suitable for beginners and families. Ride leaders wait for less experienced riders
Flexible: Riders encouraged to ride at own pace. Designated rest stops
Training: Brisk rides, may have stops for regrouping
Off-road: Substantial off-road riding. Usually not suitable for road bikes.