1

Very small hills or very little stair climbing.

A

Almost entirely on pavement.

2

Some moderate hills or stair climbing.

B

A significant part of the route is on well-groomed trails with very few obstacles.

3

Some significant hill or stair climbing.

C

A significant part of the route is on somewhat difficult terrain (rocky/rooted paths or soft sand.)

4

Lots of significant hills or stair climbing.

D

A significant part of the route is on very difficult terrain.

5

Many  steep  hills.

E

The majority of the route is on very difficult terrain.